var NN3 = false;
 image1= new Image();
 image1.src = "grafiken/startblau.gif";
 image1on = new Image();
 image1on.src = "grafiken/startgelb.gif";
 image2= new Image();
 image2.src = "grafiken/sprechstunden1.gif";
 image2on = new Image();
 image2on.src = "grafiken/sprechstunden2.gif";
 image3= new Image();
 image3.src = "grafiken/infos1.gif";
 image3on = new Image();
 image3on.src = "grafiken/infos2.gif";
 image4= new Image();
 image4.src = "grafiken/notfall1.gif";
 image4on = new Image();
 image4on.src = "grafiken/notfall2.gif";
 image5= new Image();
 image5.src = "grafiken/anfahrt1.gif";
 image5on = new Image();
 image5on.src = "grafiken/anfahrt2.gif";
 image6= new Image();
 image6.src = "grafiken/startseite1.gif";
 image6on = new Image();
 image6on.src = "grafiken/startseite2.gif";
  function on3(name)   {
         document[name].src = eval(name + "on.src");
 }
 function off3(name)  {
         document[name].src = eval(name + ".src");
 }
 NN3 = true;

 function on(name)  {
         if (NN3) on3(name);
 }
 function off(name)  {
         if (NN3) off3(name);
 }