praxis_lo = new Image();
  praxis_lo.src = "bilder/praxis.gif";
  praxis_hi = new Image();
  praxis_hi.src = "bilder/bpraxis.gif";
  team_lo = new Image();
  team_lo.src = "./bilder/team.gif";
  team_hi = new Image();
  team_hi.src = "./bilder/bteam.gif";
  wo_lo = new Image();
  wo_lo.src = "bilder/wo.gif";
  wo_hi = new Image();
  wo_hi.src = "bilder/bwo.gif";
  sprechzeiten_lo = new Image();
  sprechzeiten_lo.src = "bilder/sprechzeiten.gif";
  sprechzeiten_hi = new Image();
  sprechzeiten_hi.src = "bilder/bsprechzeiten.gif";
  person_lo = new Image();
  person_lo.src = "bilder/person.gif";
  person_hi = new Image();
  person_hi.src = "bilder/bperson.gif";
  kleinteam_lo = new Image();
  kleinteam_lo.src = "bilder/kleinteam.gif";
  kleinteam_hi = new Image();
  kleinteam_hi.src = "bilder/bkleinteam.gif";
  leistung_lo = new Image();
  leistung_lo.src = "bilder/leistung.gif";
  leistung_hi = new Image();
  leistung_hi.src = "bilder/bleistung.gif";
  standardleist_lo = new Image();
  standardleist_lo.src = "bilder/standardleist.gif";
  standardleist_hi = new Image();
  standardleist_hi.src = "bilder/bstandardleist.gif";
  individual_lo = new Image();
  individual_lo.src = "bilder/individual.gif";
  individual_hi = new Image();
  individual_hi.src = "bilder/bindividual.gif";
  operationen_lo = new Image();
  operationen_lo.src = "bilder/operationen.gif";
  operationen_hi = new Image();
  operationen_hi.src = "bilder/boperationen.gif";
  ambulante_lo = new Image();
  ambulante_lo.src = "bilder/ambulante.gif";
  ambulante_hi = new Image();
  ambulante_hi.src = "bilder/bambulante.gif";
  stationaere_lo = new Image();
  stationaere_lo.src = "bilder/stationaere.gif";
  stationaere_hi = new Image();
  stationaere_hi.src = "bilder/bstationaere.gif";
  netzwerk_lo = new Image();
  netzwerk_lo.src = "bilder/netzwerk.gif";
  netzwerk_hi = new Image();
  netzwerk_hi.src = "bilder/bnetzwerk.gif";
  
  function change(nr,objekt)  {
     nr.src = objekt.src;  }