// JavaScript Document
/**function accelerate(t,v,a){
	window.scrollBy(0,v);
	t++;
	v+=a;
	s=document.documentElement.scrollTop+document.body.scrollTop;
	//alert(s.toString());
	if (s>0){going=setTimeout(function(){accelerate(t,v,a)},27)};
	//return{finished:true};
	};//初速度是v的匀加速直线运动,加到路程终点*/
function accelerateByV(t,v0,v,a){
	window.scrollBy(0,v0);
	t++;
	v0+=a;
	var finp=false;
	if((a>=0&&v0<v)||(a<=0&&v0>v)){going=setTimeout(function(){accelerateByV(t,v0,v,a)},27)};
	finp=true;
	return{finished:finp};
	}//初速度为v0的匀加速直线运，加到动速度达到V
function cumputeCombRate(){
	//a1:a2=t2/t1;t2/(t1+t2)=0.618
	var s=document.documentElement.scrollTop+document.body.scrollTop;
	//alert(s.toString())
	var a1=-s/336;
	var a2=s/546;
	var vp=-s/21;
	
	//accelerateByV(0,-10,0,0);
	if (accelerateByV(0,0,vp,a1).finished){accelerateByV(0,vp,0,a2);}
	else{accelerateByV(0,0,vp,a1);}
		//accelerate(0,vp,a2);
	//	alert(s.toString());
	//	alert((document.documentElement.scrollTop+document.body.scrollTop).toString());
	};
	//return{time:t;};

	
var EventUtil={
	getEvent:function(event){return event?event:window.event;},
		//滚轮事件对象的 wheelDelta/FF DOMMouseScroll
	/**getWheelDelta:function(event){
		if(event.wheelDelta){//ff以外的浏览器
            //在最新版的opera中window返回undefined ， 在opera9.5中返回对象 在9.5版本之前的版本中wheelDelta的正负号颠倒的
			return (window.opera&&window.opera.version()<9.5?-event.wheelDelta:event.wheelDelta);
			}else{return -event.detail*40;}//ff
		},*/
	//事件处理程序
	addHandler:function(element,type,handler){
		if(element.addEventListener){element.addEventListener(type,handler,false)}//DOM2
		else if(element.attachEvent){element.attachEvent('on'+type,handler);}//ie
		else{element['on'+type]=handler;}//DOM0
		}
}

EventUtil.addHandler(document,'mousewheel',handleMouseWheel);//注册ie的滚轮事件
EventUtil.addHandler(document,'DOMMouseScroll',handleMouseWheel);//注册ff的滚轮事件

function handleMouseWheel(e){
                e=EventUtil.getEvent(e);
				clearTimeout(going);
				//clearTimeout(gotoo);
               /** var delta=EventUtil.getWheelDelta(e);
				
				a.innerHTML=a.innerHTML+ delta + ' ;'*/

}