CSS样式部分:
----------------------------------
<style type="text/css">
#loading-mask{
position:absolute;
left:0;
top:0;
width:100%;
height:100%;
z-index:20000;
}
#loading{
position:absolute;
left:45%;
top:40%;
padding:2px;
z-index:20001;
height:auto;
}
#loading .loading-indicator{
background:white;
color:#444;
font:bold 20px tahoma,arial,helvetica;
padding:10px;
margin:0;
height:auto;
}
#loading-msg {
font: normal 18px arial,tahoma,sans-serif;
}
</style>
HTML部分：
-------------------------------------------------
<div id=\'loading-mask\'></div>
<div id="loading">
<div class="loading-indicator">
<img src="large-loading.gif" width="32" height="32" style="margin-right:8px;float:left;vertical-align:top;"/>
<br/><span id="loading-msg">Loading ...</span>
</div>
</div>
全文：http://www.cnblogs.com/simonwy/archive/2009/11/10/1599996.html