function DisplayDiv(aSelect)
  {
  var sel_index = aSelect.options.selectedIndex;
  
    for (i=0;i<aSelect.length;i++)
    {
//	alert('in loop teller '+i);
//	alert('id'+aSelect.options[i].text);
	document.getElementById('id'+aSelect.options[i].text).className = "divinv";
    }
  
  /*alert('selected id='+document.form1.year_preken.options[selectedIndex].value);	*/
  box = document.forms[0].year_preken;
  val1=aSelect.options[sel_index].value;
  document.getElementById(val1).className = "divvis";

  };