thats easy to make.

If you wanna do it the cheesey way just make a table with the border set to 1, and cellspacing set to 0. Fill in a background color and space out the cells in the table accordingly. Of course if you use javascript it will look better, and for some good ones i'd go to JavaScript Source: Free JavaScripts, Tutorials, Example Code, Reference, Resources, and Help

Glad to help!