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];
}


var scrollerHeight = 400;
var puaseBetweenImages = 3000;
var imageIdx = 0;


function startVScroll() {
    if (isNS4)
        vSecond.top = scrollerHeight + 5;
    else
        vSecond.style.top = scrollerHeight + 5;
    moveVFirstImage(vFirst);
}
 

function moveRightEdgePosTop( posTop ) {
	var yMenuFrom, yMenuTo, yOffset, timeoutNextCheck, posTop;

	if (isNS4) {
		yMenuFrom   = divMenu.top;
		yMenuTo     = windows.pageYOffset + posTop;   // À§ÂÊ À§Ä¡
	} else if (isDOM) {
		yMenuFrom   = parseInt (divMenu.style.top, 10);
		yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop) + posTop; // 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, 10) + yOffset;
			timeoutNextCheck = 10;
	}
	setTimeout ("moveRightEdgePosTop( "+ posTop + " )", timeoutNextCheck);
}