Oh, yea nevermind I see it now. To be honest, your best fix might be to make the background gradient a couple of pixels larger, then try adding something like:
.topbar form{
margin: 2px 0 2px 0;
}
On another note, I just noticed that when you view my blog in IE, everything is aligned to the left instead of centered. Not sure why to be honest with you. At least its not all that bad looking.