IIS 5 Web Server Point to Virtual Directory On IIS 6

I have kind of a strange situation here. Our public website is running
on a IIS 5 server. We have several ASP search pages on this website.
I am slowly, as time permits, re-writting these in ASP.NET and placing
them on our new web server which is running IIS 6. On the website (on
the IIS 5 server) I need to create a link that points to the IIS 6
server. I have created a Virtual Directory and tried pointing it to
the shared folder, but all this does is bring back the HTML portion of
the page, it doesn't seem to run the application. Also I have tried
setting the virtual directory to redirect to this other web server, but
this doesn't seem to work either. It seems like the problem is that
the IIS 5 box being my "Publicly Accessible" server, it doesn't know
that the IIS 6 box exists.

Does anyone have any ideas on how to get around this issue? The
obvious would be to go ahead and move the web server to the IIS 6 box
but I really don't want to do that. I wanted to migrate the site as I
rewrote it in ASP.NET.

Any help would be greatly appreciated.

Mark