//¸ÞÀθ޴º¿¡ °ü·ÃµÈ Åܸ޴º
 var prevLayer = new Array();
 prevLayer[0] = "layer_1";
 prevLayer[1] = "layer_3";


 var prevImg  = new Array();
 prevImg[0]  = "img_1";
 prevImg[1]  = "img_3";


 
function viewLayer(nowLayer,no)
{
	//document.all[prevLayer[no]].style.display = "none";
	//document.all[nowLayer].style.display = "";
	document.getElementById(prevLayer[no]).style.display = "none";
	document.getElementById(nowLayer).style.display = "";
	prevLayer[no] = nowLayer;
}

function changeImg(nowImg,no)
{
	if ( nowImg != prevImg[no] )
	{
		/*
		prevImgSrc = document.all[prevImg[no]].src.replace("_on.gif",".gif");
		nowImgSrc = document.all[nowImg].src.replace("_off.gif",".gif");

		document.all[prevImg[no]].src = prevImgSrc.replace(".gif","_off.gif");
		document.all[nowImg].src = nowImgSrc.replace(".gif","_on.gif");
		*/
		prevImgSrc = document.getElementById(prevImg[no]).src.replace("_on.gif",".gif");
		nowImgSrc = document.getElementById(nowImg).src.replace("_off.gif",".gif");
		document.getElementById(prevImg[no]).src = prevImgSrc.replace(".gif","_off.gif");
		document.getElementById(nowImg).src = nowImgSrc.replace(".gif","_on.gif");

		prevImg[no] = nowImg;
	}
}