You're looking at the wrong thing to fix.  You need to add an "index: 1000;" to the css class(es) that are used for the submenu items.  Can't say what those classes are since every designer uses a different method and different class names for the submenus.  Setting the index on the submenu won't help, it has to be the submenu items for the css index setting to work, and you should include the td tag in the class name for the css.  So it would look something like this:  ".submenuItemClass td {index: 1000;}" and just use the text inside the quotes.  You should find the menu classes in the skin.css file in the appropriate skin directory.  You don't need to bother with whether or not the menu renders up or down, my god, you'd have to rewrite the javascript code that runs the menu and, well, adding a simple css adjustment is really simple and not quite as hair-raising as redeveloping the javascript that renders the menus...

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Rick, have you  ever tested this with the standard DNN menu?

I have and I cant get it to work as aspected.