$(function() {

	// create custom animation algorithm for jQuery called "drop"  
	$.easing.drop = function (x, t, b, c, d) { 
		return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b; 
	}; 
	 
	// create custom overlay effect for jQuery Overlay 
	$.tools.overlay.addEffect("drop",   
		 
		// loading animation 
		function(done) {  
			var animateProps = { 
				top: '+=55',  
				opacity: 1,  
				width: '+=20' 
			}; 
			this.getOverlay().animate(animateProps, "medium", 'drop', done).show(); 
		},  
		 
		// closing animation 
		function(done) { 
			var animateProps = { 
				top: '-=55',  
				opacity: 0,  
				width: '-=20' 
			}; 
			this.getOverlay().animate(animateProps, "fast", 'drop', function()  { 
				$(this).hide(); 
				done.call();         
			}); 
		} 
	);

});