
/* The following function creates an XMLHttpRequest object... */

function createRequestObject(){
	var request_o; //declare the variable to hold the object.
	var browser = navigator.appName; //find the browser name
	if(browser == "Microsoft Internet Explorer"){
		/* Create the object using MSIE's method */
		request_o = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		/* Create the object using other browser's method */
		request_o = new XMLHttpRequest();
	}
	return request_o; //return the object
}

/* You can get more specific with version information by using 
	parseInt(navigator.appVersion)
	Which will extract an integer value containing the version 
	of the browser being used.
*/
/* The variable http will hold our new XMLHttpRequest object. */
var http = createRequestObject(); 

/* Function called to get the product categories list */
function getPlaatsen(){
	/* Create the request. The first argument to the open function is the method (POST/GET),
		and the second argument is the url... 
		document contains references to all items on the page
		We can reference document.form_category_select.select_category_select and we will 		
		be referencing the dropdown list. The selectedIndex property will give us the 
		index of the selected item. 
	*/
	http.open('get', '/plaatsen.php?gemeente_id=' 
			+ document.zoek.gemeente_id.value);
	/* Define a function to call once a response has been received. This will be our
		handleProductCategories function that we define below. */
	http.onreadystatechange = handleProducts; 
	/* Send the data. We use something other than null when we are sending using the POST
		method. */
	http.send(null);
}

/* Function called to handle the list that was returned from the internal_request.php file.. */
function handleProducts(){
	/* Make sure that the transaction has finished. The XMLHttpRequest object 
		has a property called readyState with several states:
		0: Uninitialized
		1: Loading
		2: Loaded
		3: Interactive
		4: Finished */
	if(http.readyState == 4){ //Finished loading the response
		/* We have got the response from the server-side script,
			let's see just what it was. using the responseText property of 
			the XMLHttpRequest object. */
		var response = http.responseText;
		/* And now we want to change the product_categories <div> content.
			we do this using an ability to get/change the content of a page element 
			that we can find: innerHTML. */
		document.getElementById('plaatsen').innerHTML = response;
		
	}
}
//Functie om de kaart te switchen
var _img = new Array();
    _img[0] = new Image(); _img[0].src="/pics/kaartselector/kaart.gif";
    _img[1] = new Image(); _img[1].src="/pics/kaartselector/westerveld.gif";
    _img[2] = new Image(); _img[2].src="/pics/kaartselector/meppel.gif";
    _img[3] = new Image(); _img[3].src="/pics/kaartselector/dewolden.gif";
	_img[4] = new Image(); _img[4].src="/pics/kaartselector/hoogeveen.gif";
    _img[5] = new Image(); _img[5].src="/pics/kaartselector/middendrenthe.gif";
	_img[6] = new Image(); _img[6].src="/pics/kaartselector/coevorden.gif";
	_img[7] = new Image(); _img[7].src="/pics/kaartselector/emmen.gif";
    _img[8] = new Image(); _img[8].src="/pics/kaartselector/borgerodoorn.gif";
    _img[9] = new Image(); _img[9].src="/pics/kaartselector/aaenhunze.gif";
	_img[10] = new Image(); _img[10].src="/pics/kaartselector/assen.gif";
	_img[11] = new Image(); _img[11].src="/pics/kaartselector/tynaarlo.gif";
	_img[12] = new Image(); _img[12].src="/pics/kaartselector/noordenveld.gif";
function SwitchMap(_obj)
{
  if(!_obj)return;
  var _index = _obj.selectedIndex;
  if(!_index)return;
  var _item  = _obj[_index].value;
  if(!_item)return;
  if(_item<0 || _item >=_img.length)return;
  document.images["kaart"].src=_img[_item].src;
}

//Regio selector

	
	var _imgregio = new Array();
    _imgregio[0] = new Image(); _imgregio[0].src="/pics/kaartselector/kaartregio.gif";
    _imgregio[1] = new Image(); _imgregio[1].src="/pics/kaartselector/noordenmidden.gif";
    _imgregio[2] = new Image(); _imgregio[2].src="/pics/kaartselector/zuidwest.gif";
    _imgregio[3] = new Image(); _imgregio[3].src="/pics/kaartselector/zuidoost.gif";

function SwitchMapRegio(_objregio)
{

	
	
  if(!_objregio)return;
  var _index = _objregio.selectedIndex;
  if(!_index)return;
  var _item  = _objregio[_index].value;
  if(!_item)return;
  if(_item<0 || _item >=_imgregio.length)return;
  document.images["regiokaart"].src=_imgregio[_item].src;
}




//Standaard rollover script
function init() {
  if (!document.getElementById) return
  var imgOriginSrc;
  var imgTemp = new Array();
  var imgarr = document.getElementsByTagName('img');
  for (var i = 0; i < imgarr.length; i++) {
    if (imgarr[i].getAttribute('hsrc')) {
        imgTemp[i] = new Image();
        imgTemp[i].src = imgarr[i].getAttribute('hsrc');
        imgarr[i].onmouseover = function() {
            imgOriginSrc = this.getAttribute('src');
            this.setAttribute('src',this.getAttribute('hsrc'))
        }
        imgarr[i].onmouseout = function() {
            this.setAttribute('src',imgOriginSrc)
        }
    }
  }
}
onload=init;

//usage: a href="#"><img src="on.gif" hsrc="myimages/off.gif"></a>



// Preload & mouse swapping images

function newImage(arg) {
     if (document.images) {
          rslt = new Image();
          rslt.src = arg;
          return rslt;
     }
}

function changeimages() {
     if (document.images && (preloadFlag == true)) {
          for (var i=0; i<changeimages.arguments.length; i+=2) {
               document[changeimages.arguments[i]].src = changeimages.arguments[i+1];
          }
     }
}

var preloadFlag = false;
function preloadImages() {
     if (document.images) {
	home_on = newImage("/pics/m_home_on.gif");
    nieuws_on = newImage("/pics/m_nieuws_on.gif");
	routes_on = newImage("/pics/m_routes_on.gif");
	arrangementen_on = newImage("/pics/m_arrangementen_on.gif");
	kalender_on = newImage("/pics/m_kalender_on.gif");
	clubtips_on = newImage("/pics/m_clubtips_on.gif");
	forum_on = newImage("/pics/m_forum_on.gif");
	regioinfo_on = newImage("/pics/m_regioinfo_on.gif");




	links_on = newImage("/pics/m_links_on.gif");
	artikelen_on = newImage("/pics/m_artikelen_on.gif");
	accommodaties_on = newImage("/pics/m_accommodaties_on.gif");


	gastenboek_on = newImage("/pics/mi_gastenboek_on.gif");
	contact_on = newImage("/pics/m_contact_on.gif");
	sitemap_on = newImage("/pics/m_sitemap_on.gif");
	opmerkingen_on = newImage("/pics/m_opmerkingen_on.gif");
	colofon_on = newImage("/pics/m_colofon_on.gif");
	links_on = newImage("/pics/m_links_on.gif");
	
	//Submenu accommodaties
	bedandbreakfast_on = newImage("/pics/m_s_bedandbreakfast_on.gif");
	bung_appart_on = newImage("/pics/m_s_bung_appart_on_on.gif");
	campings_on = newImage("/pics/m_s_campings_on.gif");
	groepen_on = newImage("/pics/m_s_groepen_on.gif");
	hotels_on = newImage("/pics/m_s_hotels_on.gif");
	particulier_on = newImage("/pics/m_s_particulier_on.gif");
	plaggenhutten_on = newImage("/pics/m_s_plaggenhutten_on.gif");
	
	//Mouseovers voor iconen
	
	gastenboektekst_on = newImage("/pics/mi_txt_gastenboek.gif");
	contacttext_on = newImage("/pics/mi_txt_contact.gif");
	linkstext_on = newImage("/pics/mi_txt_links.gif");
	
	placeholder_on = newImage("/pics/transparant.gif");
	
	
	
	/*nieuwe site */
	
	
		placeholder_on = newImage("/pics/kaartselector/meppel.gif");
		
		
		
		
          preloadFlag = true;
     }
}


//Functie om te zoeken op gemeente / plaats
// toggle visibility

function hide( targetId ){
  if (document.getElementById){
        target = document.getElementById( targetId );
           if (target.style.display == "none"){
              target.style.display = "";
           } else {
              target.style.display = "none";
           }
     }
} 

function show( targetId ){
  if (document.getElementById){
        target = document.getElementById( targetId );
           if (target.style.display == "block"){
              target.style.display = "";
           } else {
              target.style.display = "block";
           }
     }
} 


<!--
function selSELECT(which) {
/*
   Script by Joe Crawford http://www.artlung.com/
*/
document.forms[0].mySelectBox.selectedIndex = which;
}
//-->




//Stripe them tables

// this function is needed to work around 
  // a bug in IE related to element attributes
  function hasClass(obj) {
     var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   

 function stripe(id) {

    // the flag we'll use to keep track of 
    // whether the current row is odd or even
    var even = false;
  
    // if arguments are provided to specify the colours
    // of the even & odd rows, then use the them;
    // otherwise use the following defaults:
    var evenColor = arguments[1] ? arguments[1] : "#fff";
    var oddColor = arguments[2] ? arguments[2] : "#eee";
  
    // obtain a reference to the desired table
    // if no such table exists, abort
    var table = document.getElementById(id);
    if (! table) { return; }
    
    // by definition, tables can have more than one tbody
    // element, so we'll have to get the list of child
    // &lt;tbody&gt;s 
    var tbodies = table.getElementsByTagName("tbody");

    // and iterate through them...
    for (var h = 0; h < tbodies.length; h++) {
    
     // find all the &lt;tr&gt; elements... 
      var trs = tbodies[h].getElementsByTagName("tr");
      
      // ... and iterate through them
      for (var i = 0; i < trs.length; i++) {

        // avoid rows that have a class attribute
        // or backgroundColor style
        if (! hasClass(trs[i]) &&
            ! trs[i].style.backgroundColor) {
 		  
          // get all the cells in this row...
          var tds = trs[i].getElementsByTagName("td");
        
          // and iterate through them...
          for (var j = 0; j < tds.length; j++) {
        
            var mytd = tds[j];

            // avoid cells that have a class attribute
            // or backgroundColor style
            if (! hasClass(mytd) &&
                ! mytd.style.backgroundColor) {
        
              mytd.style.backgroundColor =
                even ? evenColor : oddColor;
            
            }
          }
        }
        // flip from odd to even, or vice-versa
        even =  ! even;
      }
    }
  }
  
  
  
  // Checks the forms for correct input

function checkformdrenthekaart ( form )
{
	
	
var formObj = document.forms[0];
var count = 0;
for (i=0;i<formObj.length; i++)
{
if(formObj.elements[i].type == 'checkbox')
if(formObj.elements[i].checked)
count++;
}
if (count < 1)
{
alert("Selecteer a.u.b. een icoon voor de kaart");
return false;
} 

	
         if (form.kaartvermelding.value == "") {
        alert( "Vul a.u.b. de tekst voor uw vermelding in" );
        form.kaartvermelding.focus();
        return false ;
    }
	
         if (form.naam.value == "") {
        alert( "Vul a.u.b. uw naam in" );
        form.naam.focus();
        return false ;
    }
	
	         if (form.straat.value == "") {
        alert( "Vul a.u.b. de straatnaam in" );
        form.straat.focus();
        return false ;
    }
	
		         if (form.postcode.value == "") {
        alert( "Vul a.u.b. de postcode in" );
        form.postcode.focus();
        return false ;
    }
	
			         if (form.plaatsnaam.value == "") {
        alert( "Vul a.u.b. de plaatsnaam in" );
        form.plaatsnaam.focus();
        return false ;
    }


if (form.telefoon.value == "") {
        alert( "Vul a.u.b. uw telefoonnummer in" );
        form.telefoon.focus();
        return false ;
    }



 			
          if (form.rekeningnummer.value == "") {
        alert( "Vul a.u.b. uw rekeningnummer in" );
        form.rekeningnummer.focus();
        return false ;
    }
	
	          if (form.tenaamstelling.value == "") {
        alert( "Vul a.u.b. de naam in waarop de rekening staat" );
        form.tenaamstelling.focus();
        return false ;
    }
		
	

 
 
 
	return true ;
}
  
  
  
  function checkformvermelding ( form )
{
	
		if (form.vermelding[0].checked == false &&
		form.vermelding[1].checked == false)
	{ 
	     alert( "Selecteer a.u.b. vermelding voor de kaart" );
      
		return false;
	}
         if (form.vermelding.value == "") {
        alert( "Vul a.u.b. de tekst voor uw vermelding in" );
        form.vermelding.focus();
        return false ;
    }
	
	         if (form.categorie.value == "") {
        alert( "Vul a.u.b. de categorie in" );
        form.categorie.focus();
        return false ;
    }
	
         if (form.naam.value == "") {
        alert( "Vul a.u.b. uw naam in" );
        form.naam.focus();
        return false ;
    }
	
	         if (form.straat.value == "") {
        alert( "Vul a.u.b. de straatnaam in" );
        form.straat.focus();
        return false ;
    }
	
		         if (form.postcode.value == "") {
        alert( "Vul a.u.b. de postcode in" );
        form.postcode.focus();
        return false ;
    }
	
			         if (form.plaatsnaam.value == "") {
        alert( "Vul a.u.b. de plaatsnaam in" );
        form.plaatsnaam.focus();
        return false ;
    }


if (form.telefoon.value == "") {
        alert( "Vul a.u.b. uw telefoonnummer in" );
        form.telefoon.focus();
        return false ;
    }


 		if (form.betaalwijze[1].checked == true) {
 			
          if (form.rekeningnummer.value == "") {
        alert( "Vul a.u.b. uw rekeningnummer in" );
        form.rekeningnummer.focus();
        return false ;
    }
	
	          if (form.tenaamstelling.value == "") {
        alert( "Vul a.u.b. de naam in waarop de rekening staat" );
        form.tenaamstelling.focus();
        return false ;
    }
	
		}
 
 
 
	return true ;
}
  
  
  
  
    function checkformvermeldingenkaart ( form )
{
	
		var formObj = document.forms[0];
var count = 0;
for (i=0;i<formObj.length; i++)
{
if(formObj.elements[i].type == 'checkbox')
if(formObj.elements[i].checked)
count++;
}
if (count < 1)
{
alert("Selecteer a.u.b. een icoon voor de kaart");
return false;
} 
	
	
	
		if (form.vermelding[0].checked == false &&
		form.vermelding[1].checked == false)
	{ 
	     alert( "Selecteer a.u.b. vermelding voor de kaart" );
      
		return false;
	}
	
         if (form.kaartvermelding.value == "") {
        alert( "Vul a.u.b. de tekst voor uw kaartvermelding in" );
        form.kaartvermelding.focus();
        return false ;
    }
	
	
	
         if (form.naam.value == "") {
        alert( "Vul a.u.b. uw naam in" );
        form.naam.focus();
        return false ;
    }
	
	         if (form.straat.value == "") {
        alert( "Vul a.u.b. de straatnaam in" );
        form.straat.focus();
        return false ;
    }
	
		         if (form.postcode.value == "") {
        alert( "Vul a.u.b. de postcode in" );
        form.postcode.focus();
        return false ;
    }
	
			         if (form.plaatsnaam.value == "") {
        alert( "Vul a.u.b. de plaatsnaam in" );
        form.plaatsnaam.focus();
        return false ;
    }


if (form.telefoon.value == "") {
        alert( "Vul a.u.b. uw telefoonnummer in" );
        form.telefoon.focus();
        return false ;
    }

         if (form.categorie.value == "") {
        alert( "Vul a.u.b. de categorie in" );
        form.categorie.focus();
        return false ;
    }

 			
          if (form.rekeningnummer.value == "") {
        alert( "Vul a.u.b. uw rekeningnummer in" );
        form.rekeningnummer.focus();
        return false ;
    }
	
	          if (form.tenaamstelling.value == "") {
        alert( "Vul a.u.b. de naam in waarop de rekening staat" );
        form.tenaamstelling.focus();
        return false ;
    }


 
 
 
	return true ;
}

//disable formbutton
function init()
{
	if (!document.layers) return;
	var box = document.forms[0].elements;
	for (var i=0;i<box.length;i++)
	{
		box[i].disabled = false;
	}
}

function disableIt(obj)
{
	obj.disabled = !(obj.disabled);
	var z = (obj.disabled) ? 'disabled' : 'enabled';
}

function extracheck(obj)
{
	return !obj.disabled;
}


//mag maar twee items selecteren
var checked = 0;
function addCheck(box)
{
// allow checked box to be unchecked
if(!box.checked) return true;
// get ref to collection // see Alt:
var boxes = document.getElementsByName(box.name);
// count checked
var cb, count=0, k=0;

while(cb=boxes[k++])
if(cb.checked && ++count>2){
alert("U kunt maximaal 2 iconen selecteren");

return false;
}




if(!box.checked) return true;
// get ref to collection // see Alt:
var boxes = document.getElementsByName(box.name);
// count checked
var cb, count=0, k=0;

while(cb=boxes[k++])
if(cb.checked && ++count>1){
document.forms[0].tweedeicoon.disabled = false
document.forms[0].tweedeicoon.checked = true


return true;
}



if(!box.checked) return true;
// get ref to collection // see Alt:
var boxes = document.getElementsByName(box.name);
// count checked
var cb, count=0, k=0;

while(cb=boxes[k++])
if(cb.checked && ++count<2){
document.forms[0].tweedeicoon.disabled = false
document.forms[0].tweedeicoon.checked = false


return true;
}


return true;
}








 <!--
      function selectDiv(option, display){
        var the_div = getOptionSelected(option);
        changeDiv(the_div, display);
        }
        
      function changeDiv(the_div, display){
        var the_style = getStyleObject(the_div);
        if (the_style != false){
          the_style.display = display;
          }
        }
        
      function getOptionSelected(opt_group){
        if(document.zoek.media && document.zoek.type){
          return(document.zoek.type.options[document.zoek.type.selectedIndex].value);
          }
        else if (document.all && document.all(opt_group)){
          return(document.zoek.all(opt_group).value);
          }
        else {
          return false;
          }
        }
        
      function hideAll(){
      changeDiv("12","none");//campings
	  changeDiv("13","none");//hotels en pensions
      changeDiv("14","none");//groepsaccommodaties
	  changeDiv("15","none");//particuliere huisjes
      changeDiv("16","none");//mini en boerderijcampings			  
      changeDiv("17","none");//logies en ontbijt
	  changeDiv("18","none");//bed & breakfast
	  changeDiv("19","none");//appartementen
	  changeDiv("20","none");//trekkers-, blok-, en plaggenhutten
	  changeDiv("21","none");//bungalows
        } 
        
      function getStyleObject(objectId){
        if (document.getElementById && document.getElementById(objectId)){
          return document.getElementById(objectId).style;
          }
        else if (document.all && document.all(objectId)){
          return document.all(objectId).style;
          }
        else {
          return false;
          }
        }
      // -->

// Preload & mouse swapping images

function newImage(arg) {
     if (document.images) {
          rslt = new Image();
          rslt.src = arg;
          return rslt;
     }
}

function changeImages() {
     if (document.images && (preloadFlag == true)) {
          for (var i=0; i<changeImages.arguments.length; i+=2) {
               document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
          }
     }
}

var preloadFlag = true;
function preloadImages() {
     if (document.images) {
        fiets4daagse_on = newImage("/pics/sponsors/fiets4daagse-on.gif");
		dasnoudrenthe_on = newImage("/pics/sponsors/dasnoudrenthe-on.gif");
		recreatieschapdrenthe_on = newImage("/pics/sponsors/recschap-on.gif");
		drenthe4k_on = newImage("/pics/sponsors/drenthe4k-on.gif");
		outdoordrenthe_on = newImage("/pics/sponsors/outdoordrenthe-on.gif");
	


          preloadFlag = true;
     }
}



//arangementen check 


  function checkformarrangement ( form )
{
	
		if (form.vermelding[0].checked == false &&
		form.vermelding[1].checked == false)
	{ 
	     alert( "Selecteer a.u.b. vermelding voor de kaart" );
      
		return false;
	}
         if (form.vermelding.value == "") {
        alert( "Vul a.u.b. de tekst voor uw vermelding in" );
        form.vermelding.focus();
        return false ;
    }
	
	         if (form.categorie.value == "") {
        alert( "Vul a.u.b. de categorie in" );
        form.categorie.focus();
        return false ;
    }
	
         if (form.naam.value == "") {
        alert( "Vul a.u.b. uw naam in" );
        form.naam.focus();
        return false ;
    }
	
	         if (form.straat.value == "") {
        alert( "Vul a.u.b. de straatnaam in" );
        form.straat.focus();
        return false ;
    }
	
		         if (form.postcode.value == "") {
        alert( "Vul a.u.b. de postcode in" );
        form.postcode.focus();
        return false ;
    }
	
			         if (form.plaatsnaam.value == "") {
        alert( "Vul a.u.b. de plaatsnaam in" );
        form.plaatsnaam.focus();
        return false ;
    }


if (form.telefoon.value == "") {
        alert( "Vul a.u.b. uw telefoonnummer in" );
        form.telefoon.focus();
        return false ;
    }


 		if (form.betaalwijze[1].checked == true) {
 			
          if (form.rekeningnummer.value == "") {
        alert( "Vul a.u.b. uw rekeningnummer in" );
        form.rekeningnummer.focus();
        return false ;
    }
	
	          if (form.tenaamstelling.value == "") {
        alert( "Vul a.u.b. de naam in waarop de rekening staat" );
        form.tenaamstelling.focus();
        return false ;
    }
	
		}
 
 
 
	return true ;
}



/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = 'loading.gif';		
var closeButton = 'close.gif';		





//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}



//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}





//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
	// prep objects
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	// preload image
	imgPreload = new Image();

	imgPreload.onload=function(){
		objImage.src = objLink.href;

		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";


		
		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			objCaption.style.width = imgPreload.width + 'px';
			objCaption.innerHTML = objLink.getAttribute('title');
		} else {
			objCaption.style.display = 'none';
		}
		
		// A small pause between the image loading and displaying is required with IE,
		// this prevents the previous image displaying for a short burst causing flicker.
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		} 

		//objLoadingImage.style.display = 'none';
		objLightbox.style.display = 'block';

		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');

		return false;
	}

	imgPreload.src = objLink.href;
	
}





//
// hideLightbox()
//
function hideLightbox()
{
	// get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
}




//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{
	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {showLightbox(this); return false;}
		}
	}

	// the rest of this code inserts html at the top of the page that looks like this:
	//
	// <div id="overlay">
	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
	//			<img id="closeButton" />		
	//			<img id="lightboxImage" />
	//		</a>
	//		<div id="lightboxCaption"></div>
	// </div>
	
	var objBody = document.getElementsByTagName("body").item(0);
	
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// preload and create loader image
	var imgPreloader = new Image();
	
	// if loader image found, create link to hide lightbox and create loadingimage
	imgPreloader.onload=function(){

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs

		return false;
	}

	imgPreloader.src = loadingImage;

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';	
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#sluitfoto');
	objLink.setAttribute('title','Klik op de foto om te sluiten');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found, 
	imgPreloadCloseButton.onload=function(){

		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objCloseButton.style.top = '5px';		
		objCloseButton.style.right = '5px';		
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);
	
	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objCaption.style.display = 'none';
	objLightbox.appendChild(objCaption);

}




//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}




addLoadEvent(initLightbox);	// run initLightbox onLoad



function showlayer(whichLayer) {
document.getElementById(whichLayer).style.display = "block";
}

function hidelayer(whichLayer) {
	
document.getElementById(whichLayer).style.display = "none";





//Functie om de kaart te switchen
var _img = new Array();
    _img[0] = new Image(); _img[0].src="/pics/kaartselector/kaart.gif";
    _img[1] = new Image(); _img[1].src="/pics/kaartselector/westerveld.gif";
    _img[2] = new Image(); _img[2].src="/pics/kaartselector/meppel.gif";
    _img[3] = new Image(); _img[3].src="/pics/kaartselector/dewolden.gif";
	_img[4] = new Image(); _img[4].src="/pics/kaartselector/hoogeveen.gif";
    _img[5] = new Image(); _img[5].src="/pics/kaartselector/middendrenthe.gif";
	_img[6] = new Image(); _img[6].src="/pics/kaartselector/coevorden.gif";
	_img[7] = new Image(); _img[7].src="/pics/kaartselector/emmen.gif";
    _img[8] = new Image(); _img[8].src="/pics/kaartselector/borgerodoorn.gif";
    _img[9] = new Image(); _img[9].src="/pics/kaartselector/aaenhunze.gif";
	_img[10] = new Image(); _img[10].src="/pics/kaartselector/assen.gif";
	_img[11] = new Image(); _img[11].src="/pics/kaartselector/tynaarlo.gif";
	_img[12] = new Image(); _img[12].src="/pics/kaartselector/noordenveld.gif";
function SwitchMap(_obj)
{
  if(!_obj)return;
  var _index = _obj.selectedIndex;
  if(!_index)return;
  var _item  = _obj[_index].value;
  if(!_item)return;
  if(_item<0 || _item >=_img.length)return;
  document.images["kaart"].src=_img[_item].src;
}
	
}


/*AJAX FUNCTIES */
function createRequestObject(){
	var request_o; //declare the variable to hold the object.
	var browser = navigator.appName; //find the browser name
	if(browser == "Microsoft Internet Explorer"){
		/* Create the object using MSIE's method */
		request_o = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		/* Create the object using other browser's method */
		request_o = new XMLHttpRequest();
	}
	return request_o; //return the object
}


/* The variable http will hold our new XMLHttpRequest object. */
var http = createRequestObject(); 

/* Function called to get the product categories list */
function getPlaatsen(){
	http.open('get', 'plaatsen.php?gemeente_id='+ document.zoekacco.gemeente_id.value);
	http.onreadystatechange = handlePlaatsen; 
	http.send(null);
}


function handlePlaatsen(){
	if(http.readyState == 4){ //Finished loading the response
		var response = http.responseText;
		document.getElementById('plaatsen').innerHTML = response;
	}
}






function getSidebartools(niveau, niveaunaam, type){
	http.open('get', 'sidebartools.php?niveau='+niveau+'&niveaunaam='+niveaunaam+'&type='+type);
	http.onreadystatechange = handleSidebartools; 
	http.send(null);
}


function handleSidebartools(){
	if(http.readyState == 4){ //Finished loading the response
		var response = http.responseText;
		document.getElementById('sidebartools').innerHTML = response;
	}
}


//get minigallery
function getMinigallery(niveau, locatie, page){
	http.open('get', 'minigallery.php?niveau='+niveau+'&locatie='+locatie+'&page='+page);
	http.onreadystatechange = handleMinigallery; 
	http.send(null);
}


function handleMinigallery(){
	if(http.readyState == 4){ //Finished loading the response
		var response = http.responseText;
		document.getElementById('minigallery').innerHTML = response;
	}
}














function postReactie(){
	http.open('get', 'plaatsopmerking.php?action='+action);
	http.onreadystatechange = handlePostReactie; 
	http.send(null);
}


function handlePostReactie(){
	if(http.readyState == 4){ //Finished loading the response
		var response = http.responseText;
		document.getElementById('reacties').innerHTML = response;
	}
}


// ##################################################################################################





