// 顶部菜单
/*if(document.addEventListener)
   {
	 window.addEventListener('load',topFn,false);   
   }
   else
   {
	  window.attachEvent('onload',topFn);   
   };

function topFn()
{
   var oBanner_list=document.getElementById('banner_list');
   var oBanner_list_a=oBanner_list.children;
   var oBanner_list_a_n=0;
   var oBanner_list_a_timer=setInterval(logoaFn,5000);
   
   oBanner_list.onmouseover=function()
   {
	  clearInterval(oBanner_list_a_timer);   
   };
   
   oBanner_list.onmouseout=function()
   {
	  oBanner_list_a_timer=setInterval(logoaFn,5000);
   };
   
   function logoaFn()
   {
	  goOpacity(oBanner_list_a[oBanner_list_a_n],0);
	  oBanner_list_a_n++;
	  oBanner_list_a_n=oBanner_list_a_n==2?0:oBanner_list_a_n;
	  goOpacity(oBanner_list_a[oBanner_list_a_n],1);   
   };
   
    function goOpacity(obj,iTarget)
	  {
			// iTarget  目标值
			clearInterval(obj.timer1);
		   var objOpa1=getStyle(obj,'opacity')*10;
		   var iSpeed=iTarget?1:-1;
	
		   obj.timer1=setInterval(function(){
			 objOpa1+=iSpeed;
			 obj.style.opacity=objOpa1/10;
			 obj.style.filter='alpha(opacity:'+objOpa1*10+')';
			  if(objOpa1<=0||objOpa1>=10)  
			  {
				clearInterval(obj.timer1); 
				obj.style.zIndex=iTarget;   
			  };
		 },100);
			
			  
	  };
	  
	 
	  function getStyle(obj,attr)
	  {
		  if(obj.currentStyle)
		  {
			  return obj.currentStyle[attr];
		  }
		  else
		  {
			  return getComputedStyle(obj,false)[attr];
		  }
	  };
 };*/
	
	$.fn.imgtransition = function(o){
	var defaults = {
		speed : 5000,
		animate : 1000
	};
	o = $.extend(defaults, o);

	return this.each(function(){
		var arr_e = $("li", this);
		arr_e.css({position: "absolute"});
		arr_e.parent().css({margin: "0", padding: "0", "list-style": "none", overflow: "hidden"});

		function shownext(){
			var active = arr_e.filter(".active").length ? arr_e.filter(".active") : arr_e.first();
			var next =  active.next().length ? active.next() : arr_e.first();
			active.css({"z-index": 9});
			next.css({opacity: 0.0, "z-index": 10}).addClass('active').animate({opacity: 1.0}, o.animate, function(){
				active.removeClass('active').css({"z-index": 8});
			});
		}

		arr_e.first().css({"z-index": 9});
		setInterval(function(){
			shownext();
		},o.speed);
		
	});
};