How to get the right offset after CSS3 transform scale

Question

I'm trying to do this grid of images. If I click one of them, I want to scale everything and focus on the one I just clicked.

Here is the testing code: http://jsfiddle.net/7PzGQ/7/

Thanks!

Answer 1

Simple math probleme, check out this : http://jsfiddle.net/DoubleYo/7PzGQ/87/