I was able to reverse the “look” of the tabs, to put the curve on the bottom by removing the border-radius-top### and adding in:
-moz-border-radius-bottomleft: 3px
-moz-border-radius-bottomright: 3px
I can make the header larger, moving the tabs below the image. But then it makes a larger gap between the image and the main body of the page. Is there a way to make it so instead of hovering over the logo, they hover over the main page now?