Menu on left side of forum.

Hi there!

I'd like a menu on the left side of my forum, i have an idea of how it sohuld be done, but before i trash my forum and it's all mad. I better call on assistance, now this is where you come in.

How in the name of all that is holy do i do this.
I'd like the header to be a seperate section (so the header bit is still intact) but only a menu on the left side of the forum (like you have on the frontpage of this forum or like FeXboards.com has on their frontpage)
Now if you have questions, or i didnt make myself clear, please reply and ask for a more detailed explanation. I'd really like this.

Thank you very much for reading -