Scott, et al:> 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.
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)
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