.scrollup {
	width: 40px;
	height: 40px;
	opacity: 0.6;
	position: fixed;
	bottom: 20px;
	left: 20px;
	display: none;
	text-indent: -9999px;
	background: url('../image/icon_top.png') no-repeat;
}
.scrollup:hover {
	opacity: 0.9;
}