// JavaScript Document
//主函数
var s=function(){		
	var interv=5100; //切换时间
	var interv2=10; //切换速速
	var opac1=80; //文字背景的透明度
	var source="fade_focus" //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)
	};
		
		
	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");
	title.style.visibility ="hidden";
	var span=document.createElement("span");
	var button=document.createElement("div");
	button.className="button";button.style.visibility ="hidden";
		
	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=0;
			opac=0;
			fadeon();
		};
		
		a.className="b1";a.onmouseover=function(){this.className="b2"};
		a.onmouseout=function(){this.className="b1";};
		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);}
		}
		
						
	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;			
		alpha(div,opac);if(scton==0){
			num=-2;scrolltxt();scton=1
		};
		if(opac<100){
			timer=setTimeout(fadeon,interv2)
		}else{
			timer2=setTimeout(fadeout,interv);
			rotateslide(j);//滚动的函数
		};
	}
		
	//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)
			canvasOut();
		}else{
			if(j<li.length-1){
				j++
			}else{
				j=0
			};
			fadeon()
		};
	}
	
		
	var scrolltxt=function(){
		t+=num;
		span.style.marginTop=t+"px";
		scton=0
	};
	
		
	fadeon();		
}