<!-- 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 = 10;
var puaseBetweenImages = 3000;
var imageIdx = 0;

function moveRightEdge() {
    var yMenuFrom, yMenuTo, yOffset, timeoutNextCheck;

    if (isNS4) {
        yMenuFrom   = divMenu.top;
        yMenuTo     = windows.pageYOffset + rightC_top;   // 위쪽 위치
    } else if (isDOM) {
        yMenuFrom   = parseInt(divMenu.style.top, 10);
        yMenuTo     = (isNS ? window.pageYOffset : document.documentElement.scrollTop) + rightC_top; // 위쪽 위치
    }
    timeoutNextCheck = 500;

    if (yMenuFrom != yMenuTo) {
        yOffset = Math.ceil(Math.abs(yMenuTo - yMenuFrom) / 20);
        if (yMenuTo < yMenuFrom)
            yOffset = -yOffset;
        if (isNS4)
            divMenu.top += yOffset;
        else if (isDOM)
            divMenu.style.top = parseInt (divMenu.style.top, 10) + yOffset  + 'px';
            timeoutNextCheck = 10;
    }
    setTimeout ("moveRightEdge()", timeoutNextCheck);
}
<!-- 오른쪽 스크롤 스크립트 끝 -->