function imageoff(i)
{
	imageurl = "./m-image/mn_"+ i +"_off.gif";
	imagename = "img_no"+ i;
	document.images[imagename].src = imageurl;
}
function imageon(i)
{
	imageurl = "./m-image/mn_"+ i +"_on.gif";
	imagename = "img_no"+ i;
	document.images[imagename].src = imageurl;
}