// JavaScript Document, 'onzichtbare' tekst eerst in css display: none gegeven 
function collaps(element1) {

   element1 = document.getElementById(element1);

   if (element1.style.display == 'block' || element1.style.display == '')
      element1.style.display = 'none';
   
   return;
}
function toggleview(element1) {

   element1 = document.getElementById(element1);

   if (element1.style.display == 'none' || element1.style.display == '')
      element1.style.display = 'block';
   else
      element1.style.display = 'none';

   return;
}