html,body {
	height: 100%;
}


* html .layer_board_bg,
* html .layer_board {
	position: absolute;
}

.layer_board_bg {
	position: fixed;
	width: 100%;
	height: 100%;
	
	z-index: 1000;
	
	top: 0;
	left: 0;
	
	display: none;
	cursor: pointer;
	background: #000;
	
}

.layer_board {
	display: none;
	position: fixed;
	width:900px;
    height:550px;
	top:50%;
	left: 50%;
	margin-left: -450px;
    margin-top: -275px;
	
	
	text-align: center;
	z-index: 2000;
}

.btn_close {
	position: fixed;
	width:900px;
    height:550px;
	top:50%;
	left: 50%;
	margin-left: -450px;
    margin-top: -275px;
	/*z-index:900;*/
}

.btn_close img {
	margin-left: 843px;
    margin-top: 21px;
	cursor: pointer;
	/*z-index:900;*/
}