CAN I HAVE a Scrollbar in submenu?

[Fireblade]

is it possible to have a scrollbar in the "submenu"? I´m going to have about 600 links in a submenu and it would be nice to be able to scroll the list. Not a "microsoft windows style" scrollbar, but a goodlooking small coloradjustable scrollbar. And a want the menu to be placed at the left side of the screen, a vertical menu that is, and I want to use it in frames!
the menu is suppose to be in the left frame and all links should be shown in the right frame.
I hope you understand what I mean cause my english is not that good!
Please help me

If you want to edit my html or js files do that on: http://home.swipnet.se/fireblade/ or
http://home.swipnet.se/~w-149666/ (this is a temp adress until the "fireblade" adress is activate)

the files are named: index.html, index_left.html. index_right.html, menu.js and menucontext.js

If you can do what I need, you can e-mail the files to: p_manfred@swipnet.se