JavaScript Soap 方式调用WebService

//JavaScript 通过Soap 调用WebService 
    function SendSMSByWebService(){
    var data;
    var UserName="web服务用户名";
    var PassWord="密码";
    var strMobilePhone=document.getElementById("txtMobilePhone").value;
    var strUserName=document.getElementById("txtUserName").value;
    var UserPwd=document.getElementById("ChangePwd").value;
    var strContent="用户:"+strUserName+"您好，您的产品密码为"+UserPwd+"，请妥善保管。如有问题请致电开来客服部:";        
    var MobileReg=/^(13+\d{9})|(159+\d{8})|(153+\d{8})$/;
    var strYDKey="密匙"
        data = '<?xml version="1.0" encoding="utf-8"?>'; 
        data = data + '<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">';
        data = data + '<soap:Header>';
        data = data + '<CredentialSoapHeader xmlns="http://www.cnsec.com/">' ;
        data = data + '<UserName>'+UserName+'</UserName>' ;
        data = data + '<PassWord>'+PassWord+'</PassWord>' ;
        data = data + '</CredentialSoapHeader>';
        data = data + '</soap:Header>';
        data = data + '<soap:Body>'; 
        data = data + '<WebCntSendSmsSP xmlns="http://www.cnsec.com/">'; 
        data = data + '<strMobilePhone>'+strMobilePhone+'</strMobilePhone>';
        data = data + '<strYDKey>'+strYDKey+'</strYDKey>';
        data = data + '<strContent>'+strContent+'</strContent>'; 
        data = data + '</WebCntSendSmsSP>'; 
        data = data + '</soap:Body>'; 
        data = data + '</soap:Envelope>';
        var url="http://"+ipaddress+"/LogonWS.asmx";
        if(strMobilePhone==""){
            alert("用户手机号码为空，请填写正确的用户手机号码在发送密码!");
            document.getElementById("txtMobilePhone").focus();
            return false;
        }else if(!MobileReg.test(strMobilePhone)){
            alert("请填写正确的手机号码在发送密码！");
            document.getElementById("txtMobilePhone").focus();
            return false;
        }else{
        var xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); 
        xmlhttp.open("post",url,false);
        xmlhttp.SetRequestHeader ("Content-Type","text/xml; charset=utf-8"); 
        xmlhttp.SetRequestHeader ("Content-Length",data.length);
        xmlhttp.SetRequestHeader ("host",ipaddress);
        xmlhttp.SetRequestHeader ("SOAPAction", "http://www.cnsec.com/WebCntSendSmsSP"); 
        xmlhttp.send(data);
        var x = xmlhttp.responseXML;
        var temp=x.childNodes[1].text;//返回值
            if (temp==1){        
                alert("发送短信成功！");
            }else{
                alert("发送短信失败，请联系管理员！错误码："+temp);
            }
        }
    }