function init(f) {
			if(f.lastName!=undefined) f.lastName.setAttribute('required','Uw naam is verplicht.');
			if(f.telephone!=undefined)	f.telephone.setAttribute('required','Telefoonnummer is verplicht.');
			if(f.telephone!=undefined)	f.telephone.setAttribute('validate','numeric');
			if(f.telephone!=undefined)	f.telephone.setAttribute('message','Vul een geldig telefoonnummer in.');
			if(f.email!=undefined) {
				f.email.setAttribute('required','E-mail is verplicht.');
				f.email.setAttribute('validate','email');
				f.email.setAttribute('message','vul een geldig e-mail adres in');
				}
			if(f.email_receiver!=undefined) {
				f.email_receiver.setAttribute('required','E-mail ontvanger is verplicht.');
				f.email_receiver.setAttribute('validate','email');
				f.email_receiver.setAttribute('message','vul een geldig e-mail adres in');
				}
		
		}
		
		var tabsArray = ['overzicht','omschrijving','kenmerken','fotos','plattegrond','kaart','doorsturen','reageer','brochure'];
		
		function resetAll(){
			for (var x = 0; x <= tabsArray.length; x++){
				divname = 'div-' + tabsArray[x];
				divobj = document.getElementById(divname);
				if(divobj) {
					tabname = 'tab-' + tabsArray[x];
					tabobj = document.getElementById(tabname);
					divobj.className = 'hidediv';
					tabobj.className = tabobj.className.replace("on","off"); 
					
				}
			}

		}
		
		function changetab(tab) {
				resetAll();
				tabobj = document.getElementById('tab-' + tab);
				tabobj.className = tabobj.className.replace("off","on"); 
				document.getElementById('div-' + tab).className = 'showdiv';
				
		}
		
		


	function zoom(level)
	{
		f = document.forms['routeform'];
		f.zoomlevel.value=level;
		f.submit();
	}
	
	
		
		 var googlemapsLoaded;
 	  	 function loadGoogleMaps() {
 	  	 	if (!googlemapsLoaded) {
 	  	    	googlemapsLoaded = true;
 	  	        	document.getElementById("googlemapsIframe").src = document.getElementById("googlemapsIframe").src;
 	  	         }
 	  	  	return true;
 	  	  }