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semi-transparent popup windows

I've seen web sites that when you  mouseover a name, etc, it pops up a small, semi-transparent window. Is there an extension for that?
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There are some links on this page that show the code to create the popup effect - http://www.dynamicdrive.com/dynamicindex5/index.html

The pop-up window area is usually just a html DIV area that has its visibility set to true when the mouse cursor goes over a link.  To get a semi-transparent effect, you need to use a GIF image as the background on the DIV, but only have alternative pixels coloured in the image.  Every alternating pixel should be invisible.  This creates like a 'net' effect which to the eye appears semi transparent.
Jason C. LevineNo oneCommented:
Hi texasgymguy,

Rouchie's answer is correct, this is just a warning...

If you care about being standards compliant, make sure you test these things against the W3 validator.  For one reason or another, a lot of them will fail validation...
I believe the recommendation is correct.
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