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

jQuery(function( $ ){

	$('div#screen').serialScroll({
		target:'div#sections',
		items:'li',
		axis:'xy',
		navigation:'#navigation li a',
		next:'#nav-next',
		prev:'#nav-prev',
		duration:700,
		force:true,
		cycle:true,
		interval:5000,
		constant:true,

		onBefore:function( e, elem, $pane, $items, pos ){
			e.preventDefault();
			if( this.blur )
			this.blur();
			
			curr=pos+1;
			
			$("#nav1").removeClass("nav-current a");
			$("#nav2").removeClass("nav-current a");
			$("#nav3").removeClass("nav-current a");
			$("#nav4").removeClass("nav-current a");
			$("#nav"+curr).addClass("nav-current a");
		},
		
		onAfter:function( elem ){
			$("#nav1").addClass("nav-normal a");
			$("#nav2").addClass("nav-normal a");
			$("#nav3").addClass("nav-normal a");
			$("#nav4").addClass("nav-normal a");
		}
	});

});