Ajax 进度条设置（UpdateProgress）

<%@ Register Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="act" %>
<mce:style type="text/css"><!--
.backDiv
{
filter: alpha(opacity=30); /*IE*/
opacity: 0.3;
background-color: #666;
position: absolute;
text-align: center;
vertical-align: middle;
left:0px;
top: 0;
z-index: 100009;
filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=30);
border: none;
width:expression(window.screen.availWidth);
height:expression(document.body.clientHeight);


}
.BlockArea
{
border: solid 1px #5BA5BD;
margin-left: auto;
margin-right: auto;
background-color: #FFFFFF;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
}
.BlockArea_HeadTr { background-image: url(../../../Images/GridView/BlockAreaTitle.gif); background-color:Transparent; background-repeat:repeat; height: 25px; color: #2B546A; font-weight: bold;}
--></mce:style><style type="text/css" mce_bogus="1"> .backDiv
{
filter: alpha(opacity=30); /*IE*/
opacity: 0.3;
background-color: #666;
position: absolute;
text-align: center;
vertical-align: middle;
left:0px;
top: 0;
z-index: 100009;
filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=30);
border: none;
width:expression(window.screen.availWidth);
height:expression(document.body.clientHeight);


}
.BlockArea
{
border: solid 1px #5BA5BD;
margin-left: auto;
margin-right: auto;
background-color: #FFFFFF;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
}
.BlockArea_HeadTr { background-image: url(../../../Ima