Help adding a hover menu to a template (andreas09)

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Hi there, I'm using CMSMS .013 (for now), and I've gotten my template stuff squared away for the most part. I based this site (for my brother's Internet Gaming Cafe) on Andreas 09.

He likes it well enough, but would like to make the horizontal menu to have have a hover drop down menu with the sub pages.

I know the default templates have one, but I'm a bit green on converting CSS stuff like that. I've done some basic work, but this is a bit beyond me.

Would it be possible to get some help adding that functionality to the horizontal menu?

The site is at http://pwncafe.com

thanks in advance.