function showLayer(whichLayer){

    document.getElementById(whichLayer).style.display = 'block';
 
}

function hideLayer(whichLayer){

    document.getElementById(whichLayer).style.display = 'none';
 
}

function BlurValue(obj,value,div)
 {
 if (obj.value=='nee')
  {
   showLayer(div);
  }else{  	
  	hideLayer(div); 
  			  	
  	level2velden = document.getElementById(div).childNodes;  	
  	
  	for (x=0;x<level2velden.length;x++){
  	level2velden[x].value='';
  	}	  	
  	 	
 } 
 }