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Hi, im not sure you can wrap a standalone php application in wraps, ive never tried it though so I could be wrong. Have you tried installing it and importing plain html files to see if it works?
Even if you got the phpizabi app to wrap into your XOOPS theme it wouldnt use XOOPS users or XOOPS groups that would require considerable modification to the phpizabi script.
Your best bet would be if someone like phppp took up a project to integrate it to xoops, i believe he integrtated wordpress and mediawiki, maybe if you contact him he would look at it the site is www.xoopsforge.com your other option would be if a phpizabi or XOOPS developer creates some sort of plugin or bridge.
Michael Jackson = King Of Pop
Xoops = King Of CMS