I needed to do a similar thing a while back, and i ended up writing a little javascript which i passed the page address to, and it sends that address to the another iframe… now, im not sure whether it will work for you or not, but give it a try anyways
// place this code in the same html-page where your swf file is loaded.
<head>
<script language="JavaScript1.2">
<!--
function show(page) {
window.top.main.centerviewer.location.href = page
}
//-->
</script>
</head>
and the code on the button:
pageAddressVar = "http://www.kirupaforum.com"
on (release) {
getURL("javascript:show('"+pageAddressVar+"')");
}
if it works, kirupaforum.com should be loaded in centerviewer =)