In the future, please post about Dynamic Drive Scripts in the Dynamic Drive Scripts Help section here where I've moved this thread, and:
Please include a link to the DD script(s) in question in your post. See this post
for more information.
I'm assuming you mean:
If so, the correct way to mimic what the script does is .mouseenter(), not .mouseover(). But you have to make sure you're doing it to the right element. It's the li tag, not the a tag.
If you want more help, please include a link to the page on your site that contains the problematic code so we can check it out.