var hoogte;
	var telaag;
	function checkhoogte() {
	if (navigator.appName!="Netscape") {
	  hoogte = document.body.clientHeight;
	  if (hoogte < 500) {
	  main.style.pixelTop=-130;
	  ond1.style.pixelTop-=130;
	  ond2.style.pixelTop-=130;
	  ond3.style.pixelTop-=130;
	  telaag = true;
	  }
	}else{
	  hoogte = window.innerHeight;
	  if (hoogte < 500){
		document.main.top-=30;
		document.ond1.top-=30;
		document.ond2.top-=30;
		document.ond3.top-=30;
		document.nogeenkeer.top-=30;
		telaag = true;
	  }			
	}		
	}
	function pop(nummer, tonen) {
	  var toonarg = (tonen) ? "visible" : "hidden";
	  if (navigator.appName!="Netscape") {
		eval("popond"+nummer+".style.visibility='"+toonarg+"';");
		eval("popond"+nummer+".style.pixelLeft="+(muisx+11)+";");
		eval("popond"+nummer+".style.pixelTop="+(document.body.scrollTop+muisy+11)+";");
	  }else{
		eval("document.popond"+nummer+".visibility='"+toonarg+"';");
		eval("document.popond"+nummer+".left="+(muisx+11)+";");
		eval("document.popond"+nummer+".top="+(window.pageYOffset+muisy-110)+";");
	  }		
	}
	if (document.layers) document.captureEvents(Event.MOUSEMOVE) 
	document.onmousemove=mtrack;
	var muisx, muisy;
	function mtrack(e) {
	  if (navigator.appName=="Netscape"){
		muisx=e.screenX; muisy=e.screenY;
	  }else{
		muisx=event.x;muisy=event.y;
	  }		
	}
		
	function popUp(pagina){
	  win=window.open(pagina,"Informatie","width=640,height=480,toolbar=yes,location=no,directories=no,status=no,menubar=yes,scrollbars=yes,resizable=yes");
	}