Get Business Unit Id For the User CRM Javascript

Hi All,

JavaScript  to get Business Unit ID For the User

var businessUnitId = GetBusinessUnitIDFortheUser (loggedInUser);

function GetBusinessUnitIDFortheUser(userId) {

    try {

        if (serverUrl == null) {

            serverUrl = GetCRMServerUrl();

        }

        var oDataEndpointUrl = Xrm.Page.context.getServerUrl() + "/XRMServices/2011/OrganizationData.svc/";

        oDataEndpointUrl += "SystemUserSet?$select=BusinessUnitId&$filter=SystemUserId eq guid'" + userId + "'";

        var service = GetRequestObject();

        if (service != null) {

            service.open("GET", oDataEndpointUrl, false);

            service.setRequestHeader("X-Requested-Width", "XMLHttpRequest");

            service.setRequestHeader("Accept", "application/json,text/javascript, */*");

            service.send(null);

            var requestResults = eval('(' + service.responseText + ')').d;

            if (requestResults != null && requestResults.results.length == 1) {

                var userRecord = requestResults.results[0];

                if (userRecord.BusinessUnitId && userRecord.BusinessUnitId.Id) {

                    return userRecord.BusinessUnitId.Id;

                }

            }

        }

        return "";

    }

    catch (err) {

        return "";

    }

}