Forum Moderators: not2easy
You can look at the css as well as the source if you have FF or Moz and one of the Developer toolbar extensions....
put the <ul> inside a <div>
give the <div> a background-image for the top curve, and top padding of the corresponding height, so the list starts just at the bottom of the <div>'s background-image (top curve).
give the actual <ul> a background-image for the bottom curve, positioned bottom and some bottom padding + no-repeat, so the <ul> extends down just below the last <li>, and the background-image (bottom curve) is not hidden behind the list items.
styles the <a hrefs> and the <li>'s to get the button effect.
i hope that makes sense - in a bit of a rush!