the grabbedObject?

[Mark Swindell]

I've got a transparent button.  I'm grabbing it.  When the button goes  
over a white field I want its color to change to black, when it moves  
over a green field I want it to change to yellow.

Is there a way to refer to such an object from within a script so that

on mouseEnter
set the textColor of the grabbedObject to "yellow"
end mouseEnter

Currently I have it change color on mouseUp based on whether the loc  
of "me" (the grabbedButton) is within the rect of field "white" or  
field "yellow" but it's not what I want.