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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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    alert ("ÄúµÄä¯ÀÀÆ÷²»Ö§³ÖAJAX£¡ÇëÉý¼¶ä¯ÀÀÆ÷°æ±¾!");
    return;
    }

}
//alert("Object Build Ok");
    xmlHttp.onreadystatechange = xmlstatechange; 
    xmlHttp.open("GET",url,true); 
    xmlHttp.send(); 

  window.setTimeout("Getxmlhttp()",5000);
}

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