EDIT

/*!

 * jQuery UI Effects Shake 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/Shake

 *

 * Depends:

 *	jquery.effects.core.js

 */

(function( $, undefined ) {

$.effects.shake = function(o) {

	return this.queue(function() {

		// Create element

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

		// Set options

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

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

		var distance = o.options.distance || 20; // Default distance

		var times = o.options.times || 3; // Default # of times

		var speed = o.duration || o.options.duration || 140; // Default speed per shake

		// Adjust

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

		$.effects.createWrapper(el); // Create Wrapper

		var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';

		var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';

		// Animation

		var animation = {}, animation1 = {}, animation2 = {};

		animation[ref] = (motion == 'pos' ? '-=' : '+=')  + distance;

		animation1[ref] = (motion == 'pos' ? '+=' : '-=')  + distance * 2;

		animation2[ref] = (motion == 'pos' ? '-=' : '+=')  + distance * 2;

		// Animate

		el.animate(animation, speed, o.options.easing);

		for (var i = 1; i < times; i++) { // Shakes

			el.animate(animation1, speed, o.options.easing).animate(animation2, speed, o.options.easing);

		};

		el.animate(animation1, speed, o.options.easing).

		animate(animation, speed / 2, o.options.easing, function(){ // Last shake

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

			if(o.callback) o.callback.apply(this, arguments); // Callback

		});

		el.queue('fx', function() { el.dequeue(); });

		el.dequeue();

	});

};

})(jQuery);