I need to use this menu in my theme:
http://css.maxdesign.com.au/listamatic/horizontal15.htm

then that to make to change the id="active" to the present Link.

What exactly is the problem you are having?

Looking at your site, it appears you've already done some mods to the navigation. It would probably just be a simple matter of replacing your current navigation code with the new, then inserting the CSS into the style sheets. Since the class ids are specific to the navigion bar, you should just be able to copy and paste the code in the apropriate places. Then just ad the links and labels.