jquery完全掩饰+弹出框 _Web前端

jquery完全遮盖+弹出框
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script type="text/javascript" src="http://www.veryhuo.com/uploads/common/js/jquery-1.3.2.js"></script>
<style type="text/css">
#dialog-overlay {
	width: 100%;
	height: 100%;
	filter: alpha(opacity = 50);
	-moz-opacity: 0.5;
	-khtml-opacity: 0.5;
	opacity: 0.5;
	position: absolute;
	background: #000;
	top: 0;
	left: 0;
	z-index: 3000;
	display: none;
}

#dialog-box {
	-webkit-box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
	-moz-box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
	-moz-border-radius: 5px;
	-webkit-border-radius: 5px;
	background: #eee;
	width: 328px;
	position: absolute;
	z-index: 5000;
	display: none;
}

#dialog-box .dialog-content {
	text-align: left;
	padding: 10px;
	margin: 13px;
	color: #666;
	font-family: arial;
	font-size: 11px;
}

a.button {
	margin: 10px auto 0 auto;
	text-align: center;
	background-color: #e33100;
	display: block;
	width: 50px;
	padding: 5px 10px 6px;
	color: #fff;
	text-decoration: none;
	font-weight: bold;
	line-height: 1;
	-moz-border-radius: 5px;
	-webkit-border-radius: 5px;
	-moz-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
	-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
	text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.25);
	border-bottom: 1px solid rgba(0, 0, 0, 0.25);
	position: relative;
	cursor: pointer;
}

a.button:hover {
	background-color: #c33100;
}

#dialog-box .dialog-content p {
	font-weight: 700;
	margin: 0;
}

#dialog-box .dialog-content ul {
	margin: 10px 0 10px 20px;
	padding: 0;
	height: 50px;
}
</style>
<script type="text/javascript">
	$(document).ready(function() {
		$('a.btn-ok, #dialog-overlay, #dialog-box').click(function() {
			$('#dialog-overlay, #dialog-box').hide();
			return false;
		});
		$(window).resize(function() {
			if (!$('#dialog-box').is(':hidden'))
				popup();
		});
	});
	//Popup dialog
	function popup(message) {
		var maskHeight = $(document).height();//重点
		var maskWidth = $(window).width();//重点
		var dialogTop = (maskHeight / 2) - ($('#dialog-box').height() / 2);//重点
		var dialogLeft = (maskWidth / 2) - ($('#dialog-box').width() / 2);//重点
		$('#dialog-overlay').css({
			height : maskHeight,
			width : maskWidth
		}).show();
		$('#dialog-box').css({
			top : dialogTop,
			left : dialogLeft
		}).show();
		$('#dialog-message').html(message);
	}
</script>
</head>
<body
	onload="popup('abc')">
	<a href="javascript:popup('abc')">猛击此处，弹出层!</a>
	<div id="dialog-overlay"></div>
	<div id="dialog-box">
		<div class="dialog-content">
			<div id="dialog-message"></div>
			<a href="#" class="button">关闭</a>
		</div>
	</div>
</body>
</html>