function preLoadImages()
     {
        //Bilder = new Array();
        Pfad = "images/"
        //BilderNamen = new Array("btn_hund_grau.jpg", "btn_hund_gruen.jpg", "btn_hund_rot.jpg")
        
        imgGrey = new Image();
        imgGrey.src = Pfad + "btn_hund_grau.jpg";
        
        imgGreen = new Image();
        imgGreen.src = Pfad + "btn_hund_gruen.jpg";
        
        imgRed = new Image();
        imgRed.src = Pfad + "btn_hund_rot.jpg";
     }
   
   function init() {
       // quit if this function has already been called
       if (arguments.callee.done) return;

       // flag this function so we don't do the same thing twice
       arguments.callee.done = true;

       // create the "page loaded" message
       //var text = document.createTextNode("Page loaded!");
       //var message = document.getElementById("message");
       //message.appendChild(text);
       preLoadImages();
   };


   //onLoad function IE & firefox
   /* for Mozilla */
   if (document.addEventListener) {
       document.addEventListener("DOMContentLoaded", init, false);
   }

   /* for Internet Explorer */
   /*@cc_on @*/
   /*@if (@_win32)
       document.write("<script defer>init();<"+"/script>");
   /*@end @*/

   /* for other browsers */
   window.onload = init;