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Nice post gestroud... I forgot about this one!
radamateur this is a module that you install. Its pretty straight forward. Just muck around a lil you will figure it out.
You can also use something like
a pop up generator.
Put the code in a custom block that you want to display the popup. You can also add your picnic info in the block so it has some content.
Now all you have left to do is give the block permission so it will show where you want the pop up to display.
You keep saying index.php... No such thing with XOOPS but you could get away with it in your theme file. The only bad thing about that would be it would popup every time you loaded any page.
