Menu effect

[libyan]

i saw the menu at yugop.com !! and i like it very much and when i port thread in macrmedia forums !! they gave me fla source similar the original one !! and this is the link http://www.flashfugitive.com/ang-zhang/yug/yugo.zip

but when i research to understand the idea but i couldn't can someone give me how is script works in this FLA?

Anyone?