.login_bu {
	margin-left: 28px;
	overflow: hidden;
}

.login_bu input {
	display: inline-block;
	cursor: pointer;
}

.enter {
	width: 210px;
	height: 52px;
	background: url(../images/login_bu.png) no-repeat left top;
	text-indent: -9999em;
	float: left;
}

.enter:hover {
	background: url(../images/login_bu.png) no-repeat left -52px;
}