Hello ppl! Long time no see...

I got a task to run, but I can't figure it up cause of my BIT knowliege of JS

Now whats the task...

I got a navigation menu and I want it to change image when I go to "The next menu section" I want the js to change a specific image by different URL...

It's something similar with sitepoint nav menu... Look at the top! See the "Home - Articles - Books - etc...." when you press, lets say the "Books" section the word "Books" getting highlighed... thats what I want but with image change... I could be done by just changing the class...

The site will be dynamic so the urls will be something like host.com?go=books

If someone could help I would be very very happy... or gimme some clues...

I guess it could be done by "Switch" or "if | else"

Thanks in advance :