function toggleEntry(wer,bild)
{
 if(document.getElementById(wer).style.display == 'block')
 {

   document.getElementById(wer).style.display = 'none';
   document.getElementById(bild).src = './img/au.png';



 }
 else
 {
  document.getElementById(wer).style.display = 'block';
  document.getElementById(bild).src = './img/zu.png';

 }
}