I am not trying to belittle you here or anything, but in the Blackberry Guides section of this website, the *very first* post is an extremely detailed how to for using your blackberry as a modem. [User] HOWTO: Use BlackBerry As Modem For Laptop!
There is a link to the post. If you would have read through this, you wouldn't have had to make a totally unneccessary post like this.
I am restraining myself to the very best I can right now.