(function($) {
$.effects.shake = function(o) {
	return this.queue(function() {
		var el = $(this), props = ['position','top','left'];
		var mode = $.effects.setMode(el, o.options.mode || 'effect');
		var direction = o.options.direction || 'left';
		var distance = o.options.distance || 20;
		var times = o.options.times || 3;
		var speed = o.duration || o.options.duration || 140;
		$.effects.save(el, props); el.show();
		$.effects.createWrapper(el);
		var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';
		var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';
		var animation = {}, animation1 = {}, animation2 = {};
		animation[ref] = (motion == 'pos' ? '-=' : '+=')  + distance;
		animation1[ref] = (motion == 'pos' ? '+=' : '-=')  + distance * 2;
		animation2[ref] = (motion == 'pos' ? '-=' : '+=')  + distance * 2;
		el.animate(animation, speed, o.options.easing);
		for (var i = 1; i < times; i++) {
			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(){
			$.effects.restore(el, props); $.effects.removeWrapper(el);
			if(o.callback) o.callback.apply(this, arguments);
		});
		el.queue('fx', function() { el.dequeue(); });
		el.dequeue();
	});
};
})(jQuery);