function cursusklik(id, doel){
	  	if(document.getElementById('slide'+id)==null){
			http.open('post', 'aanbod.php', true);
			http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
			http.onreadystatechange = toonmeerinfo
			http.send('actie=meerinfo&id=' +id+'&doel='+doel);
		}else{
			new Effect.Combo('slide'+id,{duration:.5});
		}
	}
	
	function toonmeerinfo(){
		if(http.readyState == 4){
		  	var response = http.responseText;
		  	//alert(response);
		  	response = response.split('|||');
		  	var newholder = document.createElement("div");
		  	var nummer = response[0];
		  	//alert(nummer);
			newholder.id = 'slide'+nummer;
			newholder.style.display = 'none';
			document.getElementById('cursuscontainer'+nummer).appendChild(newholder);
			document.getElementById('slide'+nummer).innerHTML ="<div>"+response[1]+"</div>";
			//document.getElementById('slide'+nummer).innerHTML =response[1]; 
			new Effect.Combo('slide'+nummer,{duration:.5});
		}
		
	}
Effect.Eruit = function(element) {
     element = $(element);
     new Effect.SlideDown(element, arguments[1] || {});
 }

 Effect.Erin = function(element) {
     element = $(element);
     new Effect.SlideUp(element, arguments[1] || {});
 }

 Effect.Combo = function(element) {
     element = $(element);
     if(element.style.display == 'none') { 
          new Effect.Eruit(element, arguments[1] || {}); 
     }else { 
          new Effect.Erin(element, arguments[1] || {}); 
     }
 }