mouseLeave and linked text question

[Mark Swindell]

Can someone explain the following?  In the script below, in the first 
if/then structure, the mouse moving away from a piece  of  linked text 
causes the backgroundColor of that linked text to reset to empty.  But 
the mouse is only moving off the linked text, not out of the field.  
This makes me think a piece of linked text is a control which receives 
a mouseLeave message.  Is this correct?

But then with the repeat structure below that, only by the mouse 
actually leaving the field does the backgroundColor of all lines reset 
to empty.  Which leads me to think that the linked text it was hovering 
over was not a control.

How does this work?
Thanks
Mark

on mouseLeave
   -- unhighlight any currently highlighted text:

   if storedHilitedChunk is not empty then
     do "set the backgroundColor of" && \
         storedHilitedChunk && "to empty"
     put empty into storedHilitedChunk
   end if

   repeat with y = 1 to 3
     repeat with x = 1 to the number of lines of field y
       set the backgroundColor of line x of field y to empty
     end repeat
   end repeat

   pass mouseLeave
end mouseLeave