var isDOM = (document.getElementById ? true : false); 
    var isIE4 = ((document.all && !isDOM) ? true : false);
    var isNS4 = (document.layers ? true : false);
    
    function getRef(id) {
            if (isDOM) return document.getElementById(id);
            if (isIE4) return document.all[id];
            if (isNS4) return document.layers[id];
    }
    
    var isNS = navigator.appName == "Netscape";
    function moveRightEdge() {
            var yMenuFrom, yMenuTo, yOffset, timeoutNextCheck;
            if (isNS4) {
                    yMenuFrom   = divMenu.top;
                    yMenuTo     = windows.pageYOffset +0 ;   // À§ÂÊ À§Ä¡
            } else if (isDOM) {
                    yMenuFrom   = parseInt (divMenu.style.top, 0);
                    yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop) +0; // À§ÂÊ À§Ä¡
            }
            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, 0) + yOffset;
                            timeoutNextCheck = 10;
            }
            setTimeout ("moveRightEdge()", timeoutNextCheck);
    }
    
    if (isNS4) {
            var divMenu = document["divMenu"];
            divMenu.top = top.pageYOffset +10;
            divMenu.visibility = "visible";
            moveRightEdge();
    } else if (isDOM) {
            var divMenu = getRef('divMenu');
            divMenu.style.top = (isNS ? window.pageYOffset : document.body.scrollTop) +0;
            divMenu.style.visibility = "visible";
            moveRightEdge();
    }