function tdtreeviewClickFolder(ElementID)
{ var plus='images/tdtreeview/plus.gif';
  var plusbottom='images/tdtreeview/plusbottom.gif';
  var minus='images/tdtreeview/minus.gif';
  var minusbottom='images/tdtreeview/minusbottom.gif';
  var folder='images/tdtreeview/folder.gif';
  var folderexpanded='images/tdtreeview/folder-expanded.gif';

  //Einblenden/Ausblenden
  var subs=document.getElementById(ElementID);
  if (subs.style.display=='none')
       {subs.style.display='block';}
  else {subs.style.display='none';}
  //Folder-Symbol
  var Ficon=document.getElementById('F'+ElementID);
  if (Ficon != undefined)
  { if (subs.style.display=='none') { Ficon.src=folder; }
    else { Ficon.src=folderexpanded; }
  }

  //Plus/Minus-Symbol
  var Picon=document.getElementById('P'+ElementID);
  if (Picon != undefined)
  { if (subs.style.display=='none')
    {
      if (Picon.name=="LE") {Picon.src=plusbottom;}
      else                  {Picon.src=plus;}
    }
    else
    {
      if (Picon.name=="LE") {Picon.src=minusbottom;}
      else                  {Picon.src=minus;}
    }
  }

}