Bilder = new Array(4);
Bilder[1] = new Image(); 
Bilder[1].src = "http://skarema.com/images/submenui.gif"; 
Bilder[2] = new Image(); 
Bilder[2].src = "http://skarema.com/images/submenua.gif";
Bilder[3] = new Image(); 
Bilder[3].src = "http://skarema.com/images/submaili.gif"; 
Bilder[4] = new Image(); 
Bilder[4].src = "http://skarema.com/images/submaila.gif";

function chPic(Name, Nr) {
  window.document.images[Name].src = Bilder[Nr].src;
}