[jQuery] Superfish IE7 Error

[jQuery] Superfish IE7 Error


Hi,
I'm using superfish on a simple test menu at:
http://sandbox.jrdixey.fastmail.fm/
(css stylesheet =http://sandbox.jrdixey.fastmail.fm/jquerysandbox.css)
IE7 is kicking out an error:
Line 12, character 7: object doesn't support this property or method
It's referring to this line:
$(".nav")
TIA,
Jenny
jQuery AND Superfish noob ...