function reSize() {
  var iframe = parent.document.getElementById("ifrm");
  iframe.setAttribute('height',0);
  var height = document.documentElement.scrollHeight || document.body.scrollHeight || window.scrollMaxY || 0;
  if (window.opera){
        height = document.documentElement.offsetHeight+30;
    }
  
  iframe.setAttribute('height',height); 
/*
  alert(
	  "document.documentElement.scrollHeigh="+document.documentElement.scrollHeigh+
	  "\ndocument.body.scrollHeight="+document.body.scrollHeight+
	  "\nwindow.scrollMaxY"+window.scrollMaxY  
  );
*/
}

addEvent(window,'load',reSize,false);