Move the register/login thing above the logo.

[MarkFL]

Try this:

#header {
	margin-top: 5em;
}

#toplinks {
	top: -5em !important;
	right: 0 !important;
	width: 100%;
	background: linear-gradient(to bottom, #33cc33 0%,#003300 100%);
}

And of course edit the gradient to your liking. I only included the W3C compliant code...I use this site to generate gradient CSS for multi-browser support:

http://www.colorzilla.com/gradient-editor/