function outline(id) {

   var img = id + '_img';
   if(document.getElementById(id).style.display == 'none')
   {
    document.getElementById(id).style.display = 'block';
    document.getElementById(img).style.background = '#e4eff8 url(fileadmin/img/klapp_down.gif) no-repeat top left';
   }
   else
   {
    document.getElementById(id).style.display = 'none';
    document.getElementById(img).style.background = '#e4eff8 url(fileadmin/img/klapp_right.gif) no-repeat top left';
   }
   
}