[jQuery] Lopping scrolling menu that doesnt scroll back

[jQuery] Lopping scrolling menu that doesnt scroll back


Hi,
Notice on the www.bbc.co.uk ( iplayer section ) and on http://www.designsensory.com/
their menus dont coarsely scroll back to the start, they simply loop
with the end option joining together with the first option.
Both examples are done in jquery, can someone point me to the script
please.
Thanks