image1= new Image();
 image1.src = "design/011a_button_info.jpg";
 image1on = new Image();
 image1on.src = "design/011b_button_info.jpg";
 image2= new Image();
 image2.src = "design/012a_button_bilder.jpg";
 image2on = new Image();
 image2on.src = "design/012b_button_bilder.jpg";
 image3= new Image();
 image3.src = "design/013a_button_video.jpg";
 image3on = new Image();
 image3on.src = "design/013b_button_video.jpg";
 image4= new Image();
 image4.src = "design/014a_button_kurse.jpg";
 image4on = new Image();
 image4on.src = "design/014b_button_kurse.jpg";


 function on(name)   {
         document[name].src = eval(name + "on.src");
 }
 function off(name)  {
         document[name].src = eval(name + ".src");
 }