SlideUp/SlideDown errors in FF 1.5?

I'm getting the following errors in Firefox 1.5 when I use the SlideUp/SlideDown effects:

Error: Error in parsing value for property 'bottom'.  Declaration dropped.

Source File: http://localhost:3000/conferences/new

Line: 0

I get about 8 of them all in a row for each call; however, the effects still work as they should.  Is this a known problem, or am I doing something funny?  Any way to trace "Line 0"?

Thanks,

Duane Johnson

(canadaduane)

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