A few problems

The Problems

Well first off, I can't get the nav to sit at the bottom of the header area against the red line. When I use padding/margins everything underneath goes with it. Before I used a div for the logo, which is commented out in the CSS, but I thought this way would be easier...any ideas?

And the rest of it (everything under the under-nav bit) it looks different in IE6 and FF, I was just wondering how I could make it look more similar.

Thanks.