var str;
if(height<550)
    height=550;
if(width>500)
    width=500;

    var iFrameSrc="http://www.bhartisoftland.com/linkexchange/index.php?height="+height+"&width="+(width-12)+"&did="+domainKey;
   
    if(document.getElementById('linkExchangeDiv'))
       {
           
            str='<iframe src="'+iFrameSrc+'" align="center" height="'+height+'" width="'+width+'" scrolling="no" frameborder="0" />';
            document.getElementById('linkExchangeDiv').innerHTML=str;
        }