$(".bh_banner img").css({"z-index":1,opacity:0});
	function showYYPic(n) {
		if(n>$(".banner img").length-1) {n=0;}
		if(n==0){ns=2;} else {ns=n-1;}
		$(".banner img").eq(n).animate({"z-Index":2,opacity:1});
		$(".banner img").eq(ns).animate({"z-Index":1,opacity:0});
		n++;
		timer=setTimeout("showYYPic("+n+")",3000); //1000Ϊ1Ãë
	}
	showYYPic(0);