202054 mod to slide-in menu javscript

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Project Description:
I need a mod to my slide-in menu script. I need it so when you mouse-over a main header category the sub-menu items for that category drop down instead of just being displayed like they are now. Attached is my current menu. I need the sub-categories to be collapsed until mouse-over on a main category. If you look at how big the one I attached is you'll see what I mean. I have so many sub-categories that the menu is simply too big.

Skills required:
Anything Goes, Javascript
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