Mouse over effects

Can someone explain this to me in steps… If you click here and look at the little intro animation. I want to make it so that whenever someone clicks on an image it gets bigger, then whenever they press a close button it goes back to its normal position. Can someone explain this slowly with the code?

Thanx, J

Finally got round to actually using that code… and I can’t get it to work :(… the images just don’t expand