var t = n = 0, count;    
$(document).ready(function(){           
						   count=$("#banner_list a").length;  
						   //alert(count);
						   $("#banner_list a:not(:first-child)").hide();        
						   $("#banner_info").html($("#banner_list a:first-child").find("img").attr('alt'));        
						   $("#banner_info").click(function(){window.open($("#banner_list a:first-child").attr('href'), "_blank")});        
						   $("#banner li").click(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'));            
																																																																																																																																	   $("#banner_info").unbind().click(function(){window.open($("#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('click');    };