Customized Overlay Effect

  Overview
customized "drop" overlay effect.

Custom Overlay effect

// loading animation
$.tools.overlay.addEffect("drop", function(css, done) { 
   
   // use Overlay API to gain access to crucial elements
   var conf = this.getConf(),
       overlay = this.getOverlay();           
   
   // determine initial position for the overlay
   if (conf.fixed)  {
      css.position = 'fixed';
   } else {
      css.top += $(window).scrollTop();
      css.left += $(window).scrollLeft();
      css.position = 'absolute';
   } 
   
   // position the overlay and show it
   overlay.css(css).show();
   
   // begin animating with our custom easing
   overlay.animate({ top: '+=55',  opacity: 1,  width: '+=20'}, 400, 'drop', done);
   
   /* closing animation */
   }, function(done) {
      this.getOverlay().animate({top:'-=55', opacity:0, width:'-=20'}, 300, 'drop', function() {
         $(this).hide();
         done.call();      
      });
   }
);

JavaScript

$("img[rel]").overlay({
 effect: 'drop',
 mask: '#789'
});

View Example

Source: flowplayer.org