function showContent(rowNo)
  {
     hideAll();
     if(document.getElementById || document.all)
     {
        var descriptionNo = 'row' + rowNo;
        var imageName = 'plus' + rowNo;

       if(document.getElementById(descriptionNo).style.display == 'none')
       {
         document.getElementById(descriptionNo).style.display = 'block';
         document.images[imageName].src = 'http://entwickler.com/konferenzen/ipc07_herbst/graf/pfeil_b.gif';
       }
       else if(document.getElementById(descriptionNo).style.display == 'block')
       {
         document.getElementById(descriptionNo).style.display = 'none';
         document.images[imageName].src = 'http://entwickler.com/konferenzen/ipc07_herbst/graf/pfeil_s.gif';
       }
     }
  }