var s=function(){
    
	var interv=8000; //切换间隔时间
	var interv2=10; //切换速速
	var opac1=60; //文字背景的透明度
	var source="fade_focus" //焦点轮换图片容器的id名称
	//获取对象
	function getTag(tag,obj){
		if(obj==null){
			return document.getElementsByTagName(tag)
		}else{
			return obj.getElementsByTagName(tag)
		}
	};
	function getid(id){
		return document.getElementById(id)
	};
		
	getid(1).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(1).className="img_a_on1"
		j=0;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
	getid(1).onmouseout=function(){
		getid(1).className="img_a_down1"
	}
	getid(2).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(2).className="img_a_on2"
		j=1;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
		
	getid(2).onmouseout=function(){
		getid(2).className="img_a_down2"
	}

	getid(3).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(3).className="img_a_on3"
		j=2;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
		
	getid(3).onmouseout=function(){
		getid(3).className="img_a_down3"
	}
	getid(4).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(4).className="img_a_on4"
		j=3;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
		
	getid(4).onmouseout=function(){
		getid(4).className="img_a_down4"
	}
	getid(5).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(5).className="img_a_on5"
		j=4;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
		
	getid(5).onmouseout=function(){
		getid(5).className="img_a_down5"
	}
	getid(6).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(6).className="img_a_on6"
		j=5;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
		getid(6).onmouseout=function(){
		getid(6).className="img_a_down6"
	}
	getid(7).onmouseover=function(){
		//this.className="b2"
		clearTimeout(timer);
		clearTimeout(timer2);
		clearTimeout(timer3);
		getid(7).className="img_a_on7"
		j=6;
		scton=0;
		t=63;
		opac=0;
		fadeon();
	};
		
	getid(7).onmouseout=function(){
		getid(7).className="img_a_down7"
	}
	var opac=0,j=0,t=63,num,scton=0,timer,timer2,timer3;	
	var id=getid(source);id.removeChild(getTag("div",id)[0]);
	var li=getTag("li",id);
	var div=document.createElement("div");
	var title=document.createElement("div");
	var span=document.createElement("span");
	var button=document.createElement("div");
		button.className="button";
	for(var i=0;i<li.length;i++){
		var a=document.createElement("a");
		a.innerHTML=i+1;
		a.onclick=function(){
			/*clearTimeout(timer);
			clearTimeout(timer2);
			clearTimeout(timer3);
			j=parseInt(this.innerHTML)-1;
			scton=0;
			t=63;
			opac=0;
			fadeon();*/
		};
		//a.className="b1";
		a.onmouseover=function(){
			this.className="b2"
			clearTimeout(timer);
			clearTimeout(timer2);
			clearTimeout(timer3);
			j=parseInt(this.innerHTML)-1;
			scton=0;
			t=63;
			opac=0;
			fadeon();
		};
		a.onmouseout=function(){
			this.className="b1";
			sc(j)
		};
		button.appendChild(a);
	};
	
	//控制图层透明度
	function alpha(obj,n){
		if(document.all){
			obj.style.filter="alpha(opacity="+n+")";
		}else{
			obj.style.opacity=(n/100);
		}
	}
	//控制焦点按钮
	function sc(n){
		for(var i=0;i<li.length;i++){
			button.childNodes[i].className="b1"
		};
		button.childNodes[n].className="b2";
	}
	title.className="num_list";
	title.appendChild(span);
	alpha(title,opac1);
	id.className="d1";
	div.className="d2";
	id.appendChild(div);
	id.appendChild(title);
	id.appendChild(button);
	//渐显
	var fadeon=function(){
		opac+=5;
		div.innerHTML=li[j].innerHTML;
		span.innerHTML=getTag("img",li[j])[0].alt;alpha(div,opac);
		if(scton==0){
			sc(j);
			num=-2;scrolltxt();
			scton=1
		};
		if(opac<100){
			timer=setTimeout(fadeon,interv2)
		}else{
			timer2=setTimeout(fadeout,interv);
		};
		
	}
	//渐隐
	var fadeout=function(){
		opac-=5;
		div.innerHTML=li[j].innerHTML;
		alpha(div,opac);
	
		if(scton==0){
			num=2;
			scrolltxt();
			scton=1;
		};
		if(opac>0){
			timer=setTimeout(fadeout,interv2)
		}else{
			if(j<li.length-1){
				j++
			}else{
				j=0
			};
		fadeon()
			};
		
		}
	//滚动文字
	var scrolltxt=function(){
		t+=num;span.style.marginTop=t+"px";
		if(num<0&&t>3){
			timer3=setTimeout(scrolltxt,interv2)
		}else if(num>0&&t<62){
			timer3=setTimeout(scrolltxt,interv2)
		}else{
			scton=0
		}
	};
	fadeon();
}
//初始化
window.onload=function(){
	s();
	
};