Mouse-Over Effects on ImageButton
You can hook the client script events onmouseover and onmouseout on an ImageButton control to provide mouse-over
effects such as changing the image source of the button. Client attributes such as onmouseover are disregarded by ASP.NET
on the server and passed unchanged to the browser. If your application targets newer browsers that support DHTML, these
events will occur in the browser as the cursor passes over the button.
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