After the IFRAME is loaded, you can then change the height by doing the following:

<script type=”text/javascript”>
function iframeLoaded() {
var iFrameID = document.getElementById(‘idIframe’);
if(iFrameID) {
// here you can make the height, I delete it first, then I make it again
iFrameID.height = “”;
iFrameID.height = iFrameID.contentWindow.document.body.scrollHeight + “px”;
}
}
</script>

Then, on the IFRAME tag, you hook up the handler like this:

<iframe id=”idIframe” onload=”iframeLoaded()” …