#back a {
	display: block;
	height: 122px;
	width: 34px;
	background-image: url(http://www.fengfeeldesign.org/tora_no_shiryou/switch_img/back.gif);
	background-repeat: no-repeat;
	text-indent: -9999px;
}
#back a:link {background-position: 0px 0px}
#back a:visited {background-position: 0px 0px}
#back a:hover {background-position: -34px 0px}
#back a:active {background-position: -34px 0px}