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function myEvent(obj,ev,fn){
if(obj.attachEvent){
obj.attachEvent('on'+ev,fn);
}else{
obj.addEventListener(ev,fn,false);
}
}
myEvent(window,'load',function(){
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var pH=document.documentElement.clientHeight;
var timer=null;
var scrollTop;
window.onscroll=function(){
scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
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};
oRTT.onclick=function(){
clearInterval(timer);
timer=setInterval(function(){
var now=scrollTop;
var speed=(0-now)/5;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(scrollTop==0){
clearInterval(timer);
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document.documentElement.scrollTop=scrollTop+speed;
document.body.scrollTop=scrollTop+speed;
}, 30);
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});