(function($) {
$.effects.fold = function(o) {
	return this.queue(function() {
		var el = $(this), props = ['position','top','left'];
		var mode = $.effects.setMode(el, o.options.mode || 'hide');
		var size = o.options.size || 15;
		var horizFirst = !(!o.options.horizFirst);
		var duration = o.duration ? o.duration / 2 : $.fx.speeds._default / 2;
		$.effects.save(el, props); el.show();
		var wrapper = $.effects.createWrapper(el).css({overflow:'hidden'});
		var widthFirst = ((mode == 'show') != horizFirst);
		var ref = widthFirst ? ['width', 'height'] : ['height', 'width'];
		var distance = widthFirst ? [wrapper.width(), wrapper.height()] : [wrapper.height(), wrapper.width()];
		var percent = /([0-9]+)%/.exec(size);
		if(percent) size = parseInt(percent[1],10) / 100 * distance[mode == 'hide' ? 0 : 1];
		if(mode == 'show') wrapper.css(horizFirst ? {height: 0, width: size} : {height: size, width: 0});
		var animation1 = {}, animation2 = {};
		animation1[ref[0]] = mode == 'show' ? distance[0] : size;
		animation2[ref[1]] = mode == 'show' ? distance[1] : 0;

		wrapper.animate(animation1, duration, o.options.easing)
		.animate(animation2, duration, o.options.easing, 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);