My advise is to try to find a CSS solution. It can easily be done with position: fixed. I have made it in my recent project (unfortunately can't show it due to still in development) and in my opinion, the less Javascript the better.

Here's a link
http://www.w3.org/Style/Examples/007/menus

Oh yeah, it seems like IE6 does not like position: fixed so if you're going for IE6 support (which I highly NOT recommend. IE6 should be disposed of and one way to do it is for us to stop catering for them), then javascript is the only way to go. You can go here for more information. Its a hybrid of CSS and Javascript.
http://www.bennadel.com/blog/1734-Using-CS...ss-Browsers.htm

This post has been edited by exentric_nova: Dec 19 2009, 12:14 AM