How to slow down mouse over navigation menu

I'm usually game for faster response menus, but someone inquired about slowing down the menu.
The problem is that when the mouse moves from a main horizontal menu item to an opposite end of the screen sub menu item, sometimes the mouse may not go as desired and the menu switches on them.
Is it possible to slow down the mouse over detection so if they veer off at all for a half second it doesn't detect that?

Charles,

Very cool looking. Can you give a quick example of how to integrate this into the sitefinity cms? the scope of it's use should be just the menu's at the top of a page. it seems like it could benefit else where but without the proper integration instructions to sitefinity, i'm a bit careful about the scope of it's effect and how to integrate this.
thanks though! looks really sweet.

please provide example if possible or some basic steps on how to accomplish this :)

Charles,