var getFFVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Firefox")).split("/")[1] 
//extra height in px to add to iframe in FireFox 1.0+ browsers 
var FFextraHeight=getFFVersion>=0.1? 16 : 0 

function dyniframesize(down) { 
var pTar = null; 
if (document.getElementById){ 
pTar = document.getElementById(down); 
} 
else{ 
eval('pTar = ' + down + ';'); 
} 
if (pTar && !window.opera){ 
//begin resizing iframe 
pTar.style.display="block" 

if (pTar.contentDocument && pTar.contentDocument.body.offsetHeight){ 
//ns6 syntax 
pTar.height = pTar.contentDocument.body.offsetHeight+FFextraHeight; 
} 
else if (pTar.Document && pTar.Document.body.scrollHeight){ 
//ie5+ syntax 
pTar.height = pTar.Document.body.scrollHeight; 
} 
} 

}