i wanna do this kind of menu~

[pizza0502]

http://www.mymml.com/personal-ser-home1.html

i wanna do this kind of menu
when choose any from the 1st menu "Application Areas", then the 2nd menu will show wat u choose.
how to do it?i think it is done by javascript
but i download this website...and check on their javascritp and modify it...it cant work...
pls help me,tell me where is the important script to be changing...
waiting for replies...thx~

[jscheuer1]

http://www.dynamicdrive.com/dynamicindex1/chainedmenu/index.htm