//图片滚动  
var s=function(){  
	var interv=2000; //切换间隔时间  
	var interv2=10; //切换速度  
	var opac1=70; //文字背景的透明度  
	var source="show" //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);  
	};  
	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";  
		};  
		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=s;  


//图片无缝滚动
$.fn.imgscroll = function(o){
	var defaults = {
		speed: 40,
		amount: 0,
		width: 1,
		dir: "left"
	};
	o = $.extend(defaults, o);
	
	return this.each(function(){
		var _li = $("li", this);
		_li.parent().parent().css({overflow: "hidden", position: "relative"}); //div
		_li.parent().css({margin: "0", padding: "0", overflow: "hidden", position: "relative", "list-style": "none"}); //ul
		_li.css({position: "relative", overflow: "hidden"}); //li
		if(o.dir == "left") _li.css({float: "left"});
		
		//初始大小
		var _li_size = 0;
		for(var i=0; i<_li.size(); i++)
			_li_size += o.dir == "left" ? _li.eq(i).outerwidth(true) : _li.eq(i).outerheight(true);
		
		//循环所需要的元素
		if(o.dir == "left") _li.parent().css({width: (_li_size*3)+"px"});
		_li.parent().empty().append(_li.clone()).append(_li.clone()).append(_li.clone());
		_li = $("li", this);

		//滚动
		var _li_scroll = 0;
		function goto(){
			_li_scroll += o.width;
			if(_li_scroll > _li_size)
			{
				_li_scroll = 0;
				_li.parent().css(o.dir == "left" ? { left : -_li_scroll } : { top : -_li_scroll });
				_li_scroll += o.width;
			}
				_li.parent().animate(o.dir == "left" ? { left : -_li_scroll } : { top : -_li_scroll }, o.amount);
		}
		
		//开始
		var move = setinterval(function(){ goto(); }, o.speed);
		_li.parent().hover(function(){
			clearinterval(move);
		},function(){
			clearinterval(move);
			move = setinterval(function(){ goto(); }, o.speed);
		});
	});
};