Dynamic iFrame height, not working in ie without refresh.

When i try to dynamically change the height of an iframe in ie through
a java-script to match its content (a html page containing a flash
movie), it doesn't resize the iframe at first, but when i reload the
same page into the iFrame it resizes as planned, how come? Any ideas?

This script works well in firefox, safari and netscape, but i cant get
it to work in ie(8, 7). And i get the same problems with every
resizing script i've tried.

This is the script i use:

<script type="text/javascript">
function adjustIFrameSize(iframe)
{
if ( iframe.contentDocument ) // firefox
{
iframe.height = iframe.contentDocument.height;
}
else // IE
{
iframe.style.height =
iframe.contentWindow.document.body.scrollHeight;
}

}
</script>

The iframes:

<iframe src="centriaMenu.php" name="menu" WIDTH="800" HEIGHT="200"
hspace="0" frameborder="0" marginheight="0" marginwidth="0"></IFRAME>

<iframe src="<?php print $_POST[fileName]?>" name="contents"
onload="adjustIFrameSize(this);" id="contents" height="200"
WIDTH="800" frameborder="0" marginheight="0" marginwidth="0" ></
IFRAME>


I have a flash menu in the first iframe, the buttons on the menu uses
getURL(siteToLoad, "contents") to load another html-page into the
iframe "contents".


Is it possible to make the iFrame refresh automatically though
javascript so that i just refreshes the iframe once? Everytime ive
tried that it just ends up in a never ending refresh-loop... How can i
make this work? Is there any better script for resizing (and
refreshing after resize) the iframe height so that it matches to its
content? Please, i've been stuck with this problem for some days
now...

// Max