jQuery Infinite Carousel

$(document).ready(function(){
 
	//setup width on tour items 
	var itemLeft = 0;
	$(".cz-setup-width").each(function(el){
		$(this).css("margin-left",itemLeft+"px");
		itemLeft = itemLeft+$(this).width();
	});
	$(".tour-note p:not(:first)").hide();
	var left = 0;
	var navLeft = 0;
	var inc = $(".tour-item:first").width();
	var paddingLeft =  $(".back").width();
	var paddingRight =  $(".forward").width();
	var leftTotal = left;
	var counter = 0;
	left = 0;
	$(".forward a").click(function(){
		if(counter+1 == $(".tour-nav a").size()){
			counter = 0;
			$(".tour-nav li:first a").click();
			return false;
		}
		$(".tour-note").css({opacity:0});
		left = (left+inc);
		$(".back").removeClass("disabled");			
		var cur = $(".tour-nav li.active");
		cur.removeClass("active");
		cur.next("li").addClass("active");
		$(".tour-item-container").animate({ 
			marginLeft: "-"+(left)+"px"
		  }, 500,'swing',function(){
		  		$(".tour-note p").hide();
				$(".tour-note p:eq("+counter+")").show();
				$(".tour-note").animate({opacity:1},500);
		  });
		counter++;
		return false;
	});
	$(".back a").click(function(){
		if(counter == 0){
			counter = $(".tour-nav li").size()-1;
			$(".tour-nav li:last a").click();
			return false;
		}
		$(".tour-note").css({opacity:0});
		left = left-inc;
		var cur = $(".tour-nav li.active");
		cur.removeClass("active");
		cur.prev("li").addClass("active");
		navLeft = navLeft - 200;
		$(".tour-item-container").animate({ 
				marginLeft: "-"+(left)+"px"
		}, 500,'swing',function(){
		  		$(".tour-note p").hide();
				$(".tour-note p:eq("+counter+")").show();
				$(".tour-note").animate({opacity:1},500);
		  });
		counter--;
 
	});
	$(".tour-nav a").click(function(e){
		$(".tour-note").css({opacity:0});
		var index = $(".tour-nav a").index(this);
		counter = index;
		var go = (index*inc);
		var cur = $(".tour-nav li.active").removeClass("active");
		$(this).parents("li").addClass("active");
		$(".tour-item-container").animate({ 
				marginLeft: "-"+(go)+"px"
			  }, 500,function(){
		  		$(".tour-note p").hide();
				$(".tour-note p:eq("+index+")").show();
				$(".tour-note").animate({opacity:1},500);
		  } );
		left = go;
		return false;
	});
}); //end document.ready