<!-- 오른쪽 스크롤 스크립트 시작 -->
var isDOM = (document.getElementById ? true : false);
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);
var isNS = navigator.appName == "Netscape";

function getRef(id) {
	if (isDOM) return document.getElementById(id);
	if (isIE4) return document.all[id];
	if (isNS4) return document.layers[id];
}

function getSty(id) {
	x = getRef(id);
	return (isNS4 ? getRef(id) : getRef(id).style);
}

var scrollerHeight = 88;
var puaseBetweenImages = 3000;
var imageIdx = 0;

function moveLeftEdge() {
	var yPage, yMenuFrom, yMenuTo, yOffset, timeoutNextCheck, PageScrollTop, goMenuTop=0;
//document.body.clientWidth(또는 document.documentElement.clientWidth) 
//document.body.scrollHeight (document.documentElement.scrollHeight) 현재 스크롤 위치는 document.body.scrollTop || document.documentElement.scrollTop 

	if (isNS4) {
		yPage     = document.documentElement.scrollHeight;
		PageScrollTop     = document.documentElement.scrollTop;
	} else if (isDOM) {
		yPage     = (isNS ? document.documentElement.scrollHeight : document.body.scrollHeight);
		PageScrollTop     = (isNS ? document.documentElement.scrollTop : document.body.scrollTop);
	}
	if (PageScrollTop==0 || yPage < 1200)
	{
		if (PageScrollTop == 0)
			goMenuTop = defaultPageTop;
		else if ((PageScrollTop > 0 && PageScrollTop <= 660) && yPage < 1200)
			goMenuTop = defaultPageTop-PageScrollTop;
		else if (PageScrollTop > 660 && yPage < 1200)
			goMenuTop = 10;
	}
	else
	{
		if (PageScrollTop > 660 && yPage >= 1200)
			goMenuTop = 0;
		else if ((PageScrollTop > 0 && PageScrollTop <= 660) && yPage >= 1200)
			goMenuTop = defaultPageTop-PageScrollTop;
	}

	if (isNS4) {
		yMenuFrom   = divLeftMenu.top;
		yMenuTo     = windows.pageYOffset + goMenuTop;   // 위쪽 위치
	} else if (isDOM) {
		yMenuFrom   = parseInt (divLeftMenu.style.top, 10);
		yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop) + goMenuTop; // 위쪽 위치
	}
	timeoutNextCheck = 500;

	if (yMenuFrom != yMenuTo) {
		yOffset = Math.ceil(Math.abs(yMenuTo - yMenuFrom) / 20);
		if (yMenuTo < yMenuFrom)
			yOffset = -yOffset;
		if (isNS4)
			divLeftMenu.top += yOffset;
		else if (isDOM)
			divLeftMenu.style.top = parseInt (divLeftMenu.style.top, 10) + yOffset;
			timeoutNextCheck = 10;
	}
	setTimeout ("moveLeftEdge()", timeoutNextCheck);
}
<!-- 오른쪽 스크롤 스크립트 끝 -->