function myEvent(obj,ev,fn){

	if(obj.attachEvent){

		obj.attachEvent('on'+ev,fn);

	}else{

		obj.addEventListener(ev,fn,false);

	}

}

myEvent(window,'load',function(){

	var oRTT=document.getElementById('moquu_top');

	var pH=10;

	var timer=null;

	var scrollTop;

	window.onscroll=function(){

		scrollTop=document.documentElement.scrollTop||document.body.scrollTop;

		if(scrollTop>=pH){

			oRTT.style.display='block';

		}else{

			oRTT.style.display='none';

		}

		return scrollTop;

	};

	oRTT.onclick=function(){

		clearInterval(timer);

		timer=setInterval(function(){

			var now=scrollTop;

			var speed=(0-now)/10;

			speed=speed>0?Math.ceil(speed):Math.floor(speed);

			if(scrollTop==0){

				clearInterval(timer);

			}

			document.documentElement.scrollTop=scrollTop+speed;

			document.body.scrollTop=scrollTop+speed;

		}, 30);

	}

});