jQuery.easing.easeOutQuart = function (x, t, b, c, d) {
 return -c * ((t=t/d-1)*t*t*t - 1) + b;
};

jQuery(function( $ ){
$('#slideshow').serialScroll({
	items:'li',
	axis:'y',
	prev:'#buttons a.prev',
	next:'#buttons a.next',
	offset:0, 
	start:0,
	duration:1200,
	force:true,
	stop:true,
	lock:false,
	cycle:false,
	easing:'easeOutQuart', //use this easing equation for a funny effect
	jump: true //click on the images to scroll to them
	});
});