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);
//}

//¿ÞÂÊ ³ôÀÌ
var scrollerHeight =100;

//¿À¸¥ÂÊ ³ôÀÌ
var scrollerHeight2 =600; 

var puaseBetweenImages = 3000;
var imageIdx = 0; 



function startVScroll() { 
}

function moveRightEdge() {
        var yMenuFrom, yMenuTo, yOffset, timeoutNextCheck;
		var yMenuFrom1    ;

        if (isDOM) {
                yMenuFrom   = parseInt (layer_sky.style.top,10);
                yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop) + 0; // À§ÂÊ À§Ä¡
        }
        timeoutNextCheck = 500;

        if (yMenuFrom != yMenuTo) {
                yOffset = Math.ceil(Math.abs(yMenuTo - yMenuFrom) / 25);

                if (yMenuTo < yMenuFrom)
                        yOffset = -yOffset;


                if (isNS4){
                        layer_sky.top += yOffset;
				        layer_top.top += yOffset;
				}
                else if (isDOM){
					//¿ÞÂÊ
                        layer_sky.style.top = parseInt(layer_sky.style.top, 10) + yOffset;
				     //¿ÀÇÂÂÊ
                        layer_top.style.top = parseInt(layer_top.style.top, 10) + yOffset;
				}

                
				timeoutNextCheck = 10;
        }
        setTimeout ('moveRightEdge()', timeoutNextCheck);
}
 

//¿À¸¥ÂÊ
	var layer_top = getRef('layer_top'); 
	layer_top.style.top = (isNS ? window.pageYOffset : document.body.scrollTop) + scrollerHeight2;
	layer_top.style.visibility = "visible";

//¿ÞÂÊ
	var layer_sky = getRef('layer_sky'); 
	layer_sky.style.top = (isNS ? window.pageYOffset : document.body.scrollTop) + scrollerHeight ;
	layer_sky.style.visibility = "visible";

//À̵¿ ½ÃÀÛ 
	moveRightEdge();