Need help with an animated jQuery Nav menu- "On" State

Need help with an animated jQuery Nav menu- "On" State

Hey Guys,
New to this forum, and pretty new to jQuery. I'm trying to use this jQuery script on my website:
http://www.sohtanaka.com/web-design/ani ... ss-jquery/

I've had no problem implementing it, it works just fine. The problem I'm having is that I want the current page the user is on to remain highlighted. Does that make sense? So that the "Home" page stays on when the user is on the home page, the "About Us" page stays on when the user is on the about us page etc. With CSS rollovers I would usually just make a link class and apply it to the current page's button, but it doesn't work with this script.

Could someone help me out? I'm sure it is something very simple but I'm pretty lost when it comes to jQuery aside from just implementing scripts, so I definitely need a little help.

Thanks in advance!
geoman