Floating sidebar for my adsense.

[Harpo]

Hello.

I want to add a floating sidebar (vertical)-(fixed). on all pages. this will hold my Ads.

For an example of what i am trying to achieve please see the website below. you will notice a green floating box to the left.

http://anime.mmgn.com/Forums/Forum-Game/Anime-MMGN-Points-Tally

I'm using a fixed style too.

Please help.

Thanks :D