function feedback(targetId){
  if (document.getElementById){
  		target = document.getElementById(targetId);
  			if ((target.style.display == "none")||(target.style.display == "")){
  				target.style.display = "block";
				document.getElementById('naam').focus();
  			}
  	}
}
function toon(targetId){
  if (document.getElementById){
  		target = document.getElementById(targetId);
  			if ((target.style.display == "none")||(target.style.display == "")){
  				target.style.display = "block";
				document.getElementById('naam').focus();
  			} else {
  				target.style.display = "none";
  			}
  	}
}