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

		$.easing.easeOutQuart = function(x, t, b, c, d){
			var s=1.70158;
			return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
		};

jQuery(function( $ ){
var $pane = $('.slideshow1');//let's save it, the element being scrolled

	$pane.serialScroll({
		items:'li',
		prev:'.screen1 a.prev',
		next:'.screen1 a.next',
		axis:'x',
		duration:600,
		force:true,
		easing:'easeOutQuart',
		lazy:false,
		interval:false,
		constant:false
	});
	//scroll gallery
	 $(document).keyup(function(e){
        switch( e.keyCode ){
        	case 39://right (->)
        		$pane.trigger('next');
        	break;
        	case 37://left (<-)
        		$pane.trigger('prev');
        	break;
        }
    });
});