This effect uses two different colors for the borders of the nav buttons. White is used for left and top, and a shade from the background gradient is used for the right and bottom on the initial link state. Then the colors are swapped for the hover state to get the roll over effect of a button being pushed.
The gradient background-image on the initial links was created using Paint Shop Pro. In the non-hover state, it starts with a gold color at the left and changes to become the shade used for the heading and footer background on the right. The background-image on the hover is reversed.
Ulysses, Ulysses - Soaring through all the galaxies. In search of Earth, flying in to the night. Ulysses, Ulysses - Fighting evil and tyranny, with all his power, and with all of his might. Ulysses - no-one else can do the things you do. Ulysses - like a bolt of thunder from the blue. Ulysses - always fighting all the evil forces bringing peace and justice to all.
Hey there where ya goin', not exactly knowin', who says you have to call just one place home. He's goin' everywhere, B.J. McKay and his best friend Bear. He just keeps on movin', ladies keep improvin', every day is better than the last. New dreams and better scenes, and best of all I don't pay property tax. Rollin' down to Dallas, who's providin' my palace, off to New Orleans or who knows where. Places new and ladies, too, I'm B.J. McKay and this is my best friend Bear.