It's just a 1 frameset frame. Go there and look at the source. That's how they did it.
This is the code they used: (I hope N54 lets me show this)
<FRAMESET ROWS="100%, *" frameborder="no" framespacing=0 border=0>
<FRAME SRC="http://network54.com/Hide/Forum/153510" NAME="mainwindow" frameborder="no" framespacing="0" marginheight="0" marginwidth="0"></FRAME>
</FRAMESET><NOFRAMES><CENTER><H2>Your browser does not support frames. We recommend upgrading your browser.</H2>
<br><br>Click here to enter the page: <a href="http://network54.com/Hide/Forum/153510">http://network54.com/Hide/Forum/153510</a></CENTER></NOFRAMES>
I hope that's what you meant. If not, please explain better.