<script type="text/javascript">
	
		//Input the IDs of the IFRAMES you wish to dynamically resize to match its content height:
		//Separate each ID with a comma. Examples: ["myframe1", "myframe2"] or ["myframe"] or [] for none:
		var iframeids=["iframe"]
		
		//Should script hide iframe from browsers that don't support this script (non IE5+/NS6+ browsers. Recommended):
		var iframehide="no"
		
		// The added height to add to the iframe, helps further prevent scrollbars when resizing the contents
		var extraHeight = 35;
		
		function resizeCaller() {
			var dyniframe=new Array()
			for (i=0; i<iframeids.length; i++){
				if (document.getElementById)
					resizeIframe(iframeids)
				//reveal iframe for lower end browsers? (see var above):
				if ((document.all || document.getElementById) && iframehide=="no"){
					var tempobj=document.all? document.all[iframeids] : document.getElementById(iframeids)
					tempobj.style.display="block"
				}
			}
		}
		
		function resizeIframe(frameid){
			var currentfr=document.getElementById(frameid)
			if (currentfr && !window.opera){
				currentfr.style.display="block"
				if (currentfr.contentDocument && currentfr.contentDocument.body.offsetHeight) //ns6 syntax
				{	currentfr.height = currentfr.contentDocument.body.offsetHeight+extraHeight; }
				else if (currentfr.Document && currentfr.Document.body.scrollHeight) //ie5+ syntax
				{	currentfr.height = currentfr.Document.body.scrollHeight+extraHeight;	}
				if (currentfr.addEventListener)
					currentfr.addEventListener("load", readjustIframe, false)
				else if (currentfr.attachEvent){
					currentfr.detachEvent("onload", readjustIframe) // Bug fix line
					currentfr.attachEvent("onload", readjustIframe)
				}
			}
		}
		
		function readjustIframe(loadevt) {
			var crossevt=(window.event)? event : loadevt
			var iframeroot=(crossevt.currentTarget)? crossevt.currentTarget : crossevt.srcElement
			if (iframeroot)
				resizeIframe(iframeroot.id);
		}
		
		function loadintoIframe(iframeid, url){
			if (document.getElementById)
				document.getElementById(iframeid).src=url
		}
		
		if (window.addEventListener)
			window.addEventListener("load", resizeCaller, false)
		else if (window.attachEvent)
			window.attachEvent("onload", resizeCaller)
		else
			window.onload=resizeCaller
		
	</script>

Sometimes iframes are unavoidable, and in those cases you usually don't want it to be apparent there is one. This will find the height of the iframed contents and resize the iframe accordingly, making it appear to be part of the page. Almost positive there's a better way to do this but this worked the most consistently across browsers so I'm saving it here. Suggestions welcome, especially on methods to do the same in jQuery.

Resize iframe height based on it's content

javascript

JavaScript