Hm.. so from looking at the xNum, it goes from 2-30-somethin? Granted, that's assuming the stage size is the default, which I assume it is not.
What is the end result you're after, when the mouseY = stage.stageHeight, return 1 for the logo frame, and when mouseY = 0, return the max frame of the logo?
I (Love | Hate) Flash.
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Save a version back so others may help you!
Have fixed the problem. I just needed to separate some of the logic out and use it to set a variable which was then checked to see which direction the mouse was moving in.
Have included the update .as file here so that anyone that needs it can use it themsleves.