I use it to show loading image while perform AJAX request.
<link href="/style.css" type="text/css" rel="stylesheet" />
var overlay = new ItpOverlay("body_id");
By show() you put overlay on the element. To remove it must use the method hide().
On the demo page, you will find several ways for using. You will see how to use it with AJAX request and full page overlaying.
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