function resize(offset){  
  var frame = document.getElementById("CONTENT");  
  if(navigator.appName != "Microsoft Internet Explorer") {
    //alert("kein IE");
    var windowheight = window.innerHeight;  
  } else {
    //alert("IE");
    var windowheight = document.body.offsetHeight;
  }
  frame.style.height = (windowheight - offset) + "px";      
  frame.style.overflow = "auto";      
}