You can accomplish this effect by using an absolutely positioned div with full width, full height, black background-color, and partial opacity. That part can be accomplished with just CSS; however, you will need JavaScript to make it work completely in IE (IIRC, you need to set the height with JS, I'm not sure on this though), plus any objects you want to position on top of the darkened page.
There is a good example called Lightbox, that is designed to display images. You can modify it to mimic a pop up or anything else though.
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