New to WP, Really really trying to make my blog Cool

Hi, I’m not SURE that this is possible but, I would like to make my “Navigation Bar” (Not sure if that’s what it’s called) Change Color every time a visitor clicks on the LINK in the Bar?

I’m currently using WP Theme Reference 1.6 By SuperSite http://awesomescreenshot.com/0bbcqaee4

This is a Shot of my site http://awesomescreenshot.com/050cqar40

Is it Possible?

Thank you.