function openmenu(id,link){
		if ( ! document.getElementById(id)) {	
		
		}	
		else{
			e  = document.getElementById(id);
			e.style.display = "block";
			e.style.position = "absolute";
		}
	}
	
	function sluitmenu(id){
		if ( ! document.getElementById(id)) {	
			
		}	
		else{
			f  = document.getElementById(id);
			f.style.display = "none";

		}
		
	}
	
	function changecolor(id,kleur){
	
		
		document.getElementById(id).style.backgroundColor = kleur;
		
	}
	

  		function getLinks(name) 
  		{ 
  		
  			var obj= document.getElementById(name);
  			
  			var curleft = 0; 
  			if (obj.offsetParent) 
  			{ 
  			while (obj.offsetParent) 
  			{ 
  			curleft += obj.offsetLeft 
  			obj = obj.offsetParent; 
  			} 
  			} 
  			else if (obj.x) 
  			curleft += obj.x; //NETSCAPE 4 ONLY 
  						
  			return curleft; 
  		}
  				
  		
  		function getBoven(name2) 
  		{ 
  
  
  			var obj2= document.getElementById(name2);
  
  			var curtop = 0; 
  			if (obj2.offsetParent) 
  			{ 
  			while (obj2.offsetParent) 
  			{ 
  			curtop += obj2.offsetTop 
  			obj2 = obj2.offsetParent; 
  			} 
  			} 
  			else if (obj2.y) 
  			curtop += obj2.y; //NETSCAPE 4 ONLY 
   			return curtop; 
  		}
  		
  		
  		
  		
  		var showtabs = "tb_omschrijving";
  		
  		function showtab(tb){
	  		
	  		
	  		document.getElementById(tb).style.display = "block";
	  		
	  		
	  		if(showtabs != tb){
		  		
		  		document.getElementById(showtabs).style.display = "none";
		  		
		  		
		  		showtabs = tb;
	  		}
	  		
	  		
	  		
  		}