[jQuery] Possible animate (negative) bug w/ Firefox 2

[skube]

I am experiencing a problem with Firefox 2 and jQuery 1.2.6. I am
doing a basic slide using the $.animate into negative territory. The
animation jumps to the positive value quickly before resting at the
correct negative value. The larger the negative value, the larger the
positive swing.

This is only an issue of FF2 PC. It seems to work fine in all other
browsers FF3 Mac/PC, IE6, IE7, Safari 2, Safari 3

This is how I'm calling it:
$("#myTab").animate({
  botttom:"-100px"
}, 300)

Any suggestions appreciated.