Fix my CSS on webpage I've done

I've designed this webpage. I've programmed it with HTML and CSS. The CSS is not working exactly right, and I can't figure out why! This isn't very complex, but it's not perfectly simple, either. Here is a webpage with the CSS, where I require the help... [login to view URL] The divs "imagead" and "nav_column" should automatically fall in the *vertical* center of the page. The other content divs do not need to behave that way. The div "brandingbottom", essentially the footer, needs to stay at the bottom of webpage, not at the bottom of the browser as it does now. I will need assistance on (a) making it work in Firefox, (b) making it work in other browsers. I am willing to pay a reasonable amount for assistance on this! I will have other CSS pages needing expert help, so I'd like to establish a relationship with someone who (a) knows what they're doing, (b) is easy to communicate with. (I have another page now, after this one, that I will need help with.) Thank you for looking at this. Feel free to contact me with any questions. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Internet browsers