CSS 页面置灰等待效果

<div id='tms-comm-load' style="display:none">
 <div class='tms-load-box'>
    <img src='<%=request.getContextPath()%>/static/images/load.gif' />
    <span id="tms-load-msg"></span>
 </div>
 <div class='tms-load-mask'></div>
</div>

.tms-load-box{
	display:inline-block;
	border: 2px solid #A1C5F7;
	padding: 13px 20px;
	background:#fff;
	position:fixed;
	z-index:999999;
	color:#444;
	left:50%;
	top:50%;
	margin-left:-90px;
	margin-top:-30px;
}
.tms-load-box img{
	margin-right:10px;
}
.tms-load-mask{
	height:100%;
	width:100%;
	position:fixed;
	z-index:99999;
	left:0;
	top:0;
	background: #545454;
	opacity: 0.50;
	filter: alpha(opacity=50);
}

showLoading:function(msg){
		 var defaultMsg = "正在处理，请稍后...";
		 if(msg) defaultMsg = msg;
		 $("#tms-load-msg").html(defaultMsg);
		 $("#tms-comm-load").show();
	 },
	 hideLoading:function(){
		 $("#tms-comm-load").hide();
	 },