flipover = new Image();
flipover.src = "images/flip_2.png";
flipout = new Image();
flipout.src = "images/flip_1.png";

function changeimage(Bildid,Bildobjekt)
  {
    document.images[Bildid].src = Bildobjekt.src;
  }

function swap(targetID)
  {
    obj = document.getElementById(targetID);  
    obj.style.display = (obj.style.display == 'none') ? 'block' : 'none';
  }

var beratung_eins = "kierspel";
var beratung_zwei = "ph2.uni-koeln.de";
var kontakt_eins = "as";
var kontakt_zwei = "krug";
var kontakt_drei = "alexal";
var kontakt_vier = "thp.uni-koeln.de";
var impressum_eins = "dweil";
var impressum_zwei = "uni-koeln.de";