圖片列表橫向切換代碼

//圖片列表橫向切換
var PicnewsItem=0;
function PicnewsGo(){
		var $picnews_ul=$("#picnews_ul");
		var LiLength=$picnews_ul.find("li").length;
		var LiWidth=198;
		$picnews_ul.width(LiLength*LiWidth);
		var maxItem= LiLength;
		$("#picnews_left").click(function(){
			if($picnews_ul.is(":animated")){return;}
			if(PicnewsItem>0){
					PicnewsItem--;
					$picnews_ul.animate({marginLeft:(PicnewsItem*1*LiWidth*-1)},1000);
				}
		});
		$("#picnews_right").click(function(){
			if($picnews_ul.is(":animated")){return;}
			if(PicnewsItem<maxItem){
						PicnewsItem++;
						$picnews_ul.animate({marginLeft:(PicnewsItem*1*LiWidth*-1)},1000);
				}
		});
		
		setInterval(AutoPicnews, "3000");
		
		function AutoPicnews(){
				if(PicnewsItem<maxItem-3){
						PicnewsItem++;
						$picnews_ul.animate({marginLeft:(PicnewsItem*1*LiWidth*-1)},1000);
					}else{
						PicnewsItem=0;
							$picnews_ul.animate({marginLeft:0},1000);
						}
			}
		
	}