Read In Page On Diff Domain

i have a page that i need to load in an iframe that is on a diff domain (sub domain), i need to get the doc height of the page so that i can adjust the iframes height (so there will be no scroll bars).the problem with that is even though its on the same sever, because it is on a subdomain the browser sees it as different and restricts access to it (makes sense).

so, what we can do is have php read in the page with curl and parse it out in the iframe. that looks like <iframe src="reader.php?page=subdomain.pagename.html">but, we cannot use php on this server so i was wondering if there is an asp solution that can do the same thing (vb script). basically, i just need that asp page to grab the page on the sub domain, read it in and then output it.