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function pageLoad()
      {
        if (showPanel == true)
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        }
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function pageLoad()
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        if (showPanel == true)
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        }
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        <asp:Button ID="ButtonPopup"


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function callback() {
alert(18); //²âÊÔÊÇ·ñµ÷ÓÃÁËcallback»Øµ÷º¯Êý
if (httpRequest.readyState==4) {
if(httpRequest.status==200){
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var xmlHttp = null;
function Getxmlhttp()
{
var url = "update.php";

if (xmlHttp == null)
{
xmlHttp=GetXmlHttpObject();
  if (xmlHttp==null)
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