function checkIt(string){
 var detect = navigator.userAgent.toLowerCase();
 place = detect.indexOf(string) + 1;
 thestring = string;
 return place;
}
function resize() {
 if (checkIt('opera')){
 alert("opera")
  document.getElementById("ifrm").height =document.getElementById("ifrm").document.body.scrollHeight;
 }
 document.getElementById("ifrm").height =document.getElementById("ifrm").contentWindow.document.body.scrollHeight;
}