soap request from a aspx page to a webservice in a javascript

function soaprequest() {
try
  {
    debugger;
var AccountNo = '28880';
var UserId = "UserName";
var Password = "Password";
var MyRandomNum = "ac1234";
var strMethodResultXML = "";

var strReqxml = "ACCOUNTNO" + AccountNo + "";
    var strMethodPkg = "";
    strMethodPkg = strMethodPkg + '";
    strMethodPkg = strMethodPkg + "";

    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open('POST', 'http://serverIP/mqsubscribe/mqsmodules/mqsintegrationservice/mqsintegrationservice.asmx', false);

    xmlhttp.setRequestHeader("SOAPAction", "http://mqsubscribe/mqsintegrationservice/MQSIntegrationService/getsubscriberinfo");

    xmlhttp.onreadystatechange = function () {
        if (xmlhttp.readyState == 4) {
            if (xmlhttp.status == 200) {

                alert('done use firebug to see response');
            }
        }
    }

    xmlhttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    xmlhttp.send(strMethodPkg);
    strMethodResultXML = xmlhttp.responsetext;
}
catch (err) {
  var  txt =  err.message;
}

}