2) adjust the banner so it doesnt repeat the top image (which isnt designed to repeat) if your resolution is too high... this would involve some redesign of either the image, or the TR element that the image resides in....
-- that would require you to have a wider image. that fixes it without any hassle
1) fixing the register button to switch out so logged in users arent repeatedly reminded where the register link is..
-- seeing how the layout looks that would require to replace the whole buttonset / maybe even the header when the user logs in.