var t = n = 0, count;
	$(document).ready(function(){	
		count=$("#banner_list a").length;
		$("#banner_list a:not(:first-child)").hide();
		$("#banner_info").html($("#banner_list a:first-child").find("img").attr('alt'));
		$("#banner_info").mouseover(function(){window.open($("#banner_list a:first-child").attr('href'), "_blank")});
		$("#banner li").mouseover(function() {
			var i = $(this).text() - 1;//获取li元素内的值，即1，2，3，4
			n = i;
			if (i >= count) return;
			$("#banner_info").html($("#banner_list a").eq(i).find("img").attr('alt'));
			$("#banner_info").unbind().mouseover(function(){window.open($("#banner_list a").eq(i).attr('href'), "_blank")})
			$("#banner_list a").filter(":visible").fadeout(500).parent().children().eq(i).fadein(1000);
			document.getelementbyid("banner").style.background="";
			$(this).toggleclass("on");
			$(this).siblings().removeattr("class");
		});
		t = setinterval("showauto()", 4000);
		$("#banner").hover(function(){clearinterval(t)}, function(){t = setinterval("showauto()", 4000);});
	})
	
	function showauto()
	{
		n = n >=(count - 1) ? 0 : ++n;
		$("#banner li").eq(n).trigger('mouseover');
	}