Tabs rotate in IE 7

Hi, I'm trying to use the rotate() function on UI Tabs:
$(element).tabs().tabs('rotate', 3000); // works in all major browsers
But if I insert the 0 (or null) instead of 3000 to disable the
rotation, the example stop working in IE (call error).
$(element).tabs().tabs('rotate', 0); // doesn't work in IE, works in
Firefox
Do I something wrong?
Thanks for your help.