Integrating VB user list with other associate programs

[docvader]

I'm trying to get my chat program to work with my VB user list. It calls to the VB user list, to take the names of the members automatically, when they enter the chat. This is what the I have my chat program calling to:

document.write(" <param name = nickname value = '$fileusername");

In the template phpinclude_start, I have the following:

$fileusername = "bbuserinfo[username]";

I think that the two programs are not communicating, because my chat program is not within the vbulletin directory; it is in the main web root, alongside it.

What code would I put, where, to have the chat program (lives at x.russbo.com/hubz/) call to the vbulletin user base (lives at x.russbo.com/vb/)?

Thanks!
rich