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var xmlHttp = false; 
        try{ 
            xmlHttp = new ActiveXObject("msxml2.XMLHTTP"); 
        }catch(e1){ 
            try{ 
                xmlHttp = new ActiveXObject("microsoft.XMLHTTP"); 
            }catch(e2){ 
                try{ 
                    xmlHttp = new XMLHttpRequest(); 
                }catch(e3){ 
                    xmlHttp = false; 
                } 
            } 
        } 
        if(!xmlHttp){ 
            alert("create xmlHttpRequest fail"); 


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