This is a css issue. After looking at the source code of your site, I noticed that the navigation is setup in table cells. The main nav should be setup in lists, with the subnav in a nested list within the main nav. See suckerfish drop down tutorial on http://www.alistapart.com/articles/dropdowns. After following this tutorial, when you rollover a main nav item, the sub nav items will appear as you desire.
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