function checkForm(theForm)
{

if ( document.getElementById("voornaam").value.length == 0 )
	{
		alert("Vul je voornaam in.");
		document.getElementById("voornaam").focus();
		return false;
	}

if ( document.getElementById("achternaam").value.length < 2 )
	{
		alert("Vul je achternaam in.");
		document.getElementById("achternaam").focus();
		return false;
	}

var filter = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/; // valid
if (!filter.test(document.getElementById("emailadres").value))
	{
		alert ("Vul een geldig e-mail adres in.");
		document.getElementById("emailadres").focus();
		return false;
	}
	
if( document.provincie_form.provincie.selectedIndex == 0)
	{
		alert("Kies de provincie waar je school zich bevindt.")
		document.getElementById("provincie").focus();
		return false;
	}

if ( document.getElementById("school").value.length == 0 )
	{
		alert("Vul je school in.");
		document.getElementById("school").focus();
		return false;
	}
	
	if ( document.getElementById("wachtwoord").value.length == 0 )
	{
		alert("Vul je wachtwoord in.");
		document.getElementById("wachtwoord").focus();
		return false;
	}
	
}



function Inint_AJAX() {
   try { return new ActiveXObject("Msxml2.XMLHTTP");  } catch(e) {} //IE
   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE
   try { return new XMLHttpRequest();          } catch(e) {} //Native Javascript
   alert("XMLHttpRequest not supported");
   return null;
};

function dochange(src, val) {
var req = Inint_AJAX();
req.onreadystatechange = function () {
 if (req.readyState==4) {
      if (req.status==200) {
           document.getElementById(src).innerHTML=req.responseText;
      }
 }
};
req.open("GET", "http://www.boekenbank.com/core/scholenindex.php?data="+src+"&val="+val);
req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=iso-8859-1"); 
req.send(null); //send value
}

function highlight(bookID)
{
	if ( document.getElementById("book"+bookID).checked == true )
		document.getElementById("bookTD"+bookID).className = "highlighted";
	else
		document.getElementById("bookTD"+bookID).className = "unhighlighted";
}

/*
var page = "core/scholen2.php";
function ajax(url,target)
 {

    // native XMLHttpRequest object
   document.getElementById(target).innerHTML = 'sending...';
   if (window.XMLHttpRequest) {
       req = new XMLHttpRequest();
       req.onreadystatechange = function() {ajaxDone(target);};
       req.open("GET", url, true);
       req.send(null);
   // IE/Windows ActiveX version
   } else if (window.ActiveXObject) {
       req = new ActiveXObject("Microsoft.XMLHTTP");
       if (req) {
           req.onreadystatechange = function() {ajaxDone(target);};
           req.open("GET", url, true);
           req.send();
       }
   }
		   setTimeout("ajax(page,'scriptoutput')", 50000);
}


function ajaxDone(target) {
// only if req is "loaded"
if (req.readyState == 4) {
// only if "OK"
if (req.status == 200 || req.status == 304) {
results = req.responseText;
document.getElementById(target).innerHTML = results;
} else {
document.getElementById(target).innerHTML="ajax error:\n" +
req.statusText;
}
}
}
*/