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To integrate a non-xoops script into XOOPS requires a little knowlegde about XOOPS, PHP programming, SQL and webservers/databases. Since I'm not a developer, I can't help you with that very much.
However, if you can install the script alongside your XOOPS, you could make a link to it from your XOOPS site, and thus have it *work* with XOOPS, without being integrated with it.
To add a link to the menu, I advise you to create a custom block in the system admin -> blocks page, set it right below the menu block (use weight for this), use block type HTML, and just paste the link to the script in there, and then make sure that everyone can see the block by going to system admin -> groups. That is the easiest way to add a link.
Hope this helps...
Herko