var nowpos=0;
var tempflag=1;
var timer;
var IE = navigator.appName.charAt(0)=="M";
var NN = navigator.appName.charAt(0)=="N";

function getScrollTop() {
	if (IE) {
		return document.body.scrollTop;
	} else if (NN) {
		return window.pageYOffset;
	}
}

function scrolltop(){
	scrollit(0);
}

function scrollit(pos){
clearTimeout(timer);
	if(tempflag==1){
		nowpos=getScrollTop();
		newpos=pos;
		timer=setTimeout('moveit('+newpos+')',1);
	}else{
		dis=0;
		nowdis=0;
		newpos=pos;
		clearTimeout(timer);
		timer=setTimeout('moveit('+newpos+')',1);
	}
}

function moveit(newpos){
	tempflag=0;
	dis=(newpos-nowpos)/7;
	nowpos=nowpos+dis;
	nowdis=newpos-nowpos;
	if(nowdis<1 && nowdis>-1){
		nowpos=newpos;
		window.scroll(0,nowpos);
		clearTimeout(timer);
		tempflag=1;
	}else{
		window.scroll(0,nowpos);
		timer=setTimeout('moveit('+newpos+')',20);
	}
}