Try ditching Dreamweaver and switching to Notepad ++, less bugs, less control from big brother, more nimble, less crashes ... simply better than this pile of junk.
Ok - put your style sheet in a separate file and link it.
If you're going to use styles then don't use attributes if you can get away with it. (Have a look at CSS Zen garden - such a great site. May be a little complicated for a beginner, but it gives you something to aim for.)
Ditch the table format - it makes everything far, far more complicated; try using DIVs instead.
NEVER nest tables if you can at all avoid it. Usually you can - it's just a case of looking at column and row spans.
NEVER use something like DreamWeaver in design mode - it's a huge waste of time.
Try starting with something more basic and build it up a step at a time. Test every change stage by stage - if you're painting a picture you never paint the whole thing then take a step back and look, you always paint a piece, step back and look, paint another piece etc...
Most importantly - research which setting (relating to tags, CSS and attributes) actually performs what operation, and which affects which browser. The classic example of this is the Internet Explorer 6.0 box model problem.
But most importantly, ditch DreamWeaver. Hell! VI is better!
