EDIT

/*!

 * jQuery UI Effects Clip 1.8.24

 *

 * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)

 * Dual licensed under the MIT or GPL Version 2 licenses.

 * http://jquery.org/license

 *

 * http://docs.jquery.com/UI/Effects/Clip

 *

 * Depends:

 *	jquery.effects.core.js

 */

(function( $, undefined ) {

$.effects.clip = function(o) {

	return this.queue(function() {

		// Create element

		var el = $(this), props = ['position','top','bottom','left','right','height','width'];

		// Set options

		var mode = $.effects.setMode(el, o.options.mode || 'hide'); // Set Mode

		var direction = o.options.direction || 'vertical'; // Default direction

		// Adjust

		$.effects.save(el, props); el.show(); // Save & Show

		var wrapper = $.effects.createWrapper(el).css({overflow:'hidden'}); // Create Wrapper

		var animate = el[0].tagName == 'IMG' ? wrapper : el;

		var ref = {

			size: (direction == 'vertical') ? 'height' : 'width',

			position: (direction == 'vertical') ? 'top' : 'left'

		};

		var distance = (direction == 'vertical') ? animate.height() : animate.width();

		if(mode == 'show') { animate.css(ref.size, 0); animate.css(ref.position, distance / 2); } // Shift

		// Animation

		var animation = {};

		animation[ref.size] = mode == 'show' ? distance : 0;

		animation[ref.position] = mode == 'show' ? 0 : distance / 2;

		// Animate

		animate.animate(animation, { queue: false, duration: o.duration, easing: o.options.easing, complete: function() {

			if(mode == 'hide') el.hide(); // Hide

			$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore

			if(o.callback) o.callback.apply(el[0], arguments); // Callback

			el.dequeue();

		}});

	});

};

})(jQuery);