From doing a google search, it looks like flash prefers to be on top

no matter what z-index you throw at it, and there seems to be no perfect way around it, but one site I read said to set the wmode of the flash to transparent... I think something like this:
Code:
<embed src="main_page/ixl_sale.swf" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" wmode="transparent" name="obj1" width="258" height="326" quality="High"></object>
Anyway, its worth giving a try
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