Im looking for a quick CSS fix for this.

Large images in my image gallery are scaled down so they dont break the layout. Once you click on it, it displays in full size (in a very cool way).

http://www.planetboredom.net/viewer.php?id=4057&cid=32

What I wanna do is add an onmouseover behavior that will pop up a semi-transparent box over the image that says "Click here to see full size" when you move the mouse over the image link.

Any ideas how I can do that?

Moved to Web Design and Content.

Try these...

http://www.dynamicdrive.com/dynamicindex4/indexb.html
http://www.dynamicdrive.com/dynamicindex4/thumbnail2.htm
http://www.dynamicdrive.com/dynamicindex4/thumbnail.htm

That wasn't very helpfull. I need a text/image overlay over the original image on mouseover.