function ad(element, options){
		this.element		= element;
		this.options		= options;

		this.linkNum		= this.options.linkNum;
		this.width			= this.options.width + 'px';
		this.height			= this.options.height + 'px';
		this.oAd			= $("div#"+this.element);			//广告根节点
		this.oAd.css({"width":this.width, "height": this.height});	//设定高喝宽
		var html			= '<ul class="slider" ></ul><ul class="num"></ul>';
		this.oAd.append(html);
		oSlider				= $("ul.slider");		//滑块节点
		oNum				= $("ul.num");			//链接节点
		//向链接节点中插入链接块
		var img, linkBox;
		for(var i = 1; i <= this.linkNum; i++){
			linkBox		= '<li>'+ i +'</li>';
			img			= '<li><a href="" target="_blank"><img src="" width="'+ this.width +'" height="'+ this.height +'" /></a></li>';
			oSlider.append(img);
			oNum.append(linkBox);
		}
	}
	ad.prototype	= {
		//动画效果函数
		runAnimate: function(){

			 var len  = $("ul.num > li").length;
			 var index = 0;
			 var adTimer;
			 var oAd		= this.oAd;
			 $("ul.num li").mouseover(function(){
										index  =   $("ul.num li").index(this);
										showImg(index);
			 						}).eq(0).mouseover();
			 this.oAd.hover(function(){
								clearInterval(adTimer);
							},
							function(){
								adTimer = setInterval(function(){
															showImg(index);
															index++;
															if(index==len){index=0;}
														}, 
														4000//停留时间单位MS
							);
						}).trigger("mouseleave");
			function showImg(index){
				var adHeight = oAd.height();
				$("ul.slider").stop(true,false).animate({top : -adHeight*index},1000);
				$("ul.num li").removeClass("on").eq(index).addClass("on");
			}
		},
		
		//从JSON加载图片
		loadFJSON: function(images){
			var data, name, src, linkUrl, i, width, height;
			i	= 0;
			width		= this.width.toString();
			height		= this.height.toString();
			for(key in images){
				//alert('xx');
				data		= images[key];
				name		= data.name;
				src			= data.src;
				linkUrl		= data.linkUrl;
				$("ul.slider li").eq(i).children("a").attr("href", linkUrl);
				$("ul.slider li").eq(i).children("a").children("img").attr({src:src, alt:name});
				i++;
			}
			this.runAnimate();
		},
		
		//从xml文件加载图片
		loadFXML: function(XMLUrl){},
		
		//从ajax加载图片
		loadFAJAX: function(ajaxUrl){}
	};