//首页图片轮转
var t = n = 0, count; 
$(document).ready(function(){ 
count=$("#gdtp_banner_list a").length; 
$("#gdtp_banner_list a:not(:first-child)").hide(); 
//$("#gdtp_banner_info").html($("#gdtp_banner_list a:first-child").find("img").attr('alt')); 
$("#gdtp_banner_info").html($("#gdtp_banner_list a:first-child").attr('alt')); 
$("#gdtp_banner_info").click(function(){window.open($("#gdtp_banner_list a:first-child").attr('href'), "_blank")}); 
$("#gdtp_banner li").click(function() { 
var i = $(this).text() - 1;//取li元素内的值
n = i; 
if (i >= count) return; 
$("#gdtp_banner_info").html($("#gdtp_banner_list a").eq(i).attr('alt')); 
$("#gdtp_banner_info").unbind().click(function(){window.open($("#gdtp_banner_list a").eq(i).attr('href'), "_blank")}) 
$("#gdtp_banner_list a").filter(":visible").fadeOut(500).parent().children().eq(i).fadeIn(1000); 
$(this).css({"background":"#be2424",'color':'#000'}).siblings().css({"background":"#6f4f67",'color':'#fff'}); 
}); 
t = setInterval("showAuto()", 4000); 
$("#gdtp_banner").hover(function(){clearInterval(t)}, function(){t = setInterval("showAuto()", 4000);}); 
}) 

function showAuto() 
{ 

n = n >=(count - 1) ? 0 : ++n; 
$("#gdtp_banner li").eq(n).trigger('click'); 
}