Editting the 'sliding menu' code? resizing the boxes?

Hi i recently went through this tutorial >

http://www.kirupa.com/developer/flash8/slidingMenu.htm

This is exactly the type of menu I want, however, it’s too small.

I’m doing a project for uni and we have to make a basic website that is 600px by 800px, i want to make that tutorial menu above that size, how do I go about this? I tried resizing the boxes manually but now the whole thing stops working :huh:

im really new to flash and ive never used it before, thanks so much