I am using the Smart Folding Menu Tree Script from Dynamic Drive

http://www.dynamicdrive.com/dynamicindex1/navigate1.htm

I just have one problem. I would like to change the style of the category I am in to font-weight:normal (once it is selected and open)
For example if "News" is open I want him not to be bold anymore. He will only be bold if the "news" category is closed.

Thanks for the help