Solution for Long UL/LI-Based CSS Menus

I am using CSS Menu v2 for my website. (Or any simple vertical CSS menus.)

The problem is some of my categories have man开发者_JS百科y items and this cause menus on Level 2,3,... are very long height.

One of my solutions is using some vertical scrolls like: jQuery vScroll. But all of them have "overflow: hidden;" to their containers. So when I apply them to level 2 for instance, level 3 menus didn't show on mouseover.

Is there any solution for these long menus? Or any ideas how to overflow them correctly?

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Doing a CSS mega menu might be a good option - they're pretty commonplace now - but here's a demo from a NetTuts.

And here's the tutorial itself.