Well, due to some of the addresses being stripped, I cannot help with the css... but I can tell you did not validate!

You need to validate as you code... otherwise it will not do as you think.
Additionally, you eed to test in other browsers as you build, as it saves a lot of time being wasted making something good in 1 Browser, and then realising you have to redo half of it for the others... (or worse!).

Still, if you validate, you can correct half the problems instantly... such as :
not <br>... but <br /> for XHTML.
not <img></img> (which you missed!)... but <img />
If using DL, where is DD?

So, make the validation, make the corrections (hell, W3C even allow you to use HTML Tidy (or TIDY HTML?) to clean up and correct the code for you when it validates!!!

http://validator.w3.org

So do then, then come back and let us know if it helped.

also play around with providing a link to the site page for us to see live.