FYI, it's called the Throbber (no, i'm not kidding)
Anyway, I know there's a bunch of MAC throbbers
http://www.resexcellence.com/user_throbbers.shtml
there...you might try one, see if it works (no guarantee)
Otherwise, try a search on throbber images on google, see what happens.
crackprogram: Yes.
1 bitmap 22x22 pixels
1 bitmap 38x38 pixels
These images are for the animations:
1 bitmap 22x220 pixels
1 bitmap 38x380 pixels
Basically, there's one small & one large bitmap. If you're new(ish) to doing this, you might want to grab a copy of the Internet Explorer Admin Kit (IEAK) from
www.microsoft.com, they've got a tool for setting this up & specs for the images.