function toggleCollapse(element){
			// vars
			var classname = "selected";
			var regex = new RegExp("(^|\\s)"+classname+"(\\s|$)");
			var toCollapse = document.getElementById(element.id.replace("th-", "tb-"));
			
			// toon visueel hulpje
			if(regex.test(element.className)){
				element.className = "nws-th";
				toCollapse.style.display = "none";
			}
			else {
				element.className += " " + classname;
				toCollapse.style.display = "block";
			}
			return false;
		}
	
    function checkFields(formname) {
				// controleer het formulier
				return checkForm(document.forms[formname]);
    }
	
		function popup() {
//			 window.open('/popup.asp', 'popup', 'width=450,height=600,top=50,left=150,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=no')
//			 window.open('/popup.asp', 'popup', 'width=298,height=421,top=50,left=150,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=no')
		}

	  function zoomFoto(fotoid, tekst)
	  {
	    fotozoom = window.open('zoomfoto.asp?intFotoID=' + fotoid + '&strTekst=' + tekst, window.name+"X", 'resizable=no, scrollbars=no, status=0, menubar=no, width=200, height=200');
	    if(parseInt(navigator.appVersion)>=3) 
	      fotozoom.focus();
	      return;
	  }
		
		function checkPollOptions(strMaxAntwoorden, intAantalOpties)
		{
			selectedOptions = 0;
			
			for(i=1; i <= intAantalOpties; i++)
			{
				if(document.getElementById('pollOption_'+i ) && document.getElementById('pollOption_'+i ).checked)
				{
					selectedOptions++;
				}
			}
			
			if(selectedOptions > strMaxAntwoorden )
			{
				alert("U kunt maximaal " +strMaxAntwoorden+ " antwoorden selecteren!");
				return false;
			}
			if(selectedOptions == 0 )
			{
				alert("U moet minimaal 1 antwoord selecteren!");
				return false;
			}
			
			return true;
		}