I had to use em once, and much as I DO hate them, its actually not THAT bad in terms of code, just strip of pretty much everything and do...
<frameset>
<frame name="main" src="http://www.site.com">
</frameset>
I had to use this when my old hoster (didn't take me long to move away) decided on a good idea, it went along the lines of the fact that my php files would only work in the cgi-bin directory, but this wasn't www.mysite.com/cgi-bin/
this was cgi.myothersite.com/cgi-bin/
where myothersite was the same site, but under a different name, because its a freeby they gave me when I moved to them as an ISP, basically a hideously complicated system (their clocks also moved to BST 2 months early, their support was a 72 hour feedback service etc...)
Anyways, hope you sort something.