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are you asking how to use flash in a XOOPS page, so you could say have a flash movie play or use a flash based menu.
I have a flash based menu at www.macmend.com, the code for this is placed in the theme.html file.
this is done by creating a flashlet linking it to a .swf file the file path for which appears to demand <{$xoops_imageurl}> and embeding the code into your theme as our friend has already said.