Showing/Hiding Images on mouseLeave...

[Rob Cozens]

>  > If the top image has transparent pixels,
>>  moving the cursor from an opaque portion of the image to a
>>  transparent portion WITHIN THE SAME IMAGE will generate a mouseLeave,
>>  and moving from transparent to opaque portions generates a mouseEnter.
>
>This is desirable behavior since it allows you to employ non-rectangular
>regions.

Scott, et al:

As a general feature, yes; but in the specific instance and way Igor 
is using the images, it could mean problems if that is not the effect 
he was intending.  Show the user a circle with a transparent center; 
from the point of view of the user, the cursor is over (inside) the 
image even when it is over the transparent center.
-- 

Rob Cozens
CCW, Serendipity Software Company
http://www.oenolog.com/who.htm

"And I, which was two fooles, do so grow three;
Who are a little wise, the best fooles bee."

from "The Triple Foole" by John Donne (1572-1631)