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The problem is that the section on right (the center block) is not a frame - it can't contain pages loaded from other sites, only inline html. Now what you could do is make a file on your site that uses the theme and templates, and wrap that around the content you want opening in the center. Play with the themes source files and you can see how XOOPS manages displaying content, it pretty much just dumps out all the left blocks and the title section, then the center block content, then the right block (if any). Hope that at least points you in the right direction