IFrame Resize Javascript by Gavin Taylor - http://gavtaylor.co.uk - Dec 2007
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/**
 * Function for auto resizing Iframe to fit content.
 * Ensure that both the correct containing iframe is referenced as well as the body of loaded page.
 * @param String contentFrame is the frame to resize in the parent document
 * @param String bodyID       is the id of the body that you wish to get the size of and pass to the iframe
 */

function resizeIframe(contentFrame,bodyID) 
{ 
	if(navigator.userAgent.indexOf("Firefox")!=-1)	
	{
    	// FF stuff goes here //     
	   	if(self==parent) return false; // Checks that page is in iframe. 
	   	else if(document.getElementById) // Sniffs for page
	 	var FramePageHeight = document.getElementById(bodyID).offsetHeight + 20; // add int to compensate for scrollbars
	    parent.document.getElementById(contentFrame).style.height=FramePageHeight; // set frame height
	
	} 
	else if(navigator.userAgent.indexOf("Opera")!=-1)	
	{
		//Opera stuff goes here    
		if(self==parent) return false; 
	   	else if(document.getElementById) // Sniffs for page
	  	var FramePageHeight = document.getElementById(bodyID).scrollHeight + 20; // add int to compensate for scrollbars
	   	parent.document.getElementById(contentFrame).style.height=FramePageHeight; // set frame height
    		
	}	
	else	
	{
		 //IE stuff goes here              
		  if(self==parent) return false; // Checks that page is in iframe.
		  else if(document.getElementById) // Sniffs for page
		  var FramePageHeight = document.getElementById(bodyID).scrollHeight + 20; // add int to compensate for scrollbars
		  parent.document.getElementById(contentFrame).style.height=FramePageHeight;// set frame height
	}
}