While this will solve the problem, it may have adverse effects on the rest of the page:

Code: Select all

#navigation {
    position: absolute;
    top: 20px;
    right: 0;
    width: 100%;
    border-top: 10px;
}

It should be mentioned that setting a global margin and padding of zero is merely a preference, not a requirement for things to turn out right. Personally, I don't do it that way.

I do agree that we need to see the page in action though.