function resizeBackground(){
   if (navigator.appName == "Microsoft Internet Explorer"){
      window.document.getElementById("background").style.height =
         window.document.getElementById("site").offsetHeight - 150 + "px";
      window.document.getElementById("menue-middle").style.height =
         window.document.getElementById("body-middle").offsetHeight - 120 + "px";
      window.document.getElementById("body-all").style.height =
         window.document.getElementById("menue").offsetHeight - 100  + "px";
   } else
      window.document.getElementById("background").style.height = window.document.getElementById("site").offsetHeight + "px";
}