http://www.minionlinemuseum.com/index.html at the bottom of this site, there are 3 images, and when you hover your mouse over it, the image moves to the top... i don't know how to explain it clearly. I'm just wondering how they did this. what it is called and stuff... thanks.
The <img> element is positioned though CSS with absolute position and nested inside an <a> element with CSS atributes display:block; width:yy px; height:yy px; overflow:hidden (so you wont be able to see the part of the image that goes out of the <a> height) and position:relative (so the <img> absolute position will work relatively to the <a>). Javascript then does the work. When you mouse hover the <img> style attribute "top" is changed to -50px...