So if you aren't using Dreamweaver, what are you using?
To clean up your CSS a bit, you are going to want to make sure that all your attributes are in this form:
attribute:
value;
For example, attached to your "center" div, you have this statement:
Make sure that you have a value in there for top, even if it is 0. It should look like this:
The same goes for your "bottom" div. There you have a measurement of "px," but no value to tell the browser how many px it needs to be. If you are leaving the lines blank like that, it's better to delete them then anything else.
You're also still missing 5 closing <div> tags in there, which will mess up your code. EVERY <div> tag needs a closing tag so your browser knows where to begin or end the others.
Try looking at the source on
this page on my site. It's a pretty simply coded page, so hopefully you'll be able to follow it. Every div has a matching end tag that is lined up with it, even where the divs are nested.
I would also STRONGLY recommend working through some tutorials on web design, like the ones over at
www.echoecho.com or
www.w3schools.com . That will help you out a lot.