Get User Security Roles in Jscript

function GetAllSystemRoles() {
    var serverUrl = Xrm.Page.context.getServerUrl();

    var oDataEndpointUrl = serverUrl + "/XRMServices/2011/OrganizationData.svc/";
    oDataEndpointUrl += "RoleSet";
    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;
    return requestResults;
    }
}


function GetRoleIdByName(allsecurityRoles,rolename) {
    if (allsecurityRoles != null && allsecurityRoles.results.length > 0) {
        for (var i = 0; i < allsecurityRoles.results.length; i++) {
            var role = allsecurityRoles.results[i];
            if (role.Name == rolename) {
                id = role.RoleId;
                return id;
            }

        }
    }
    return null;
}

function UserHasRole(allsecurityRoles) {
    debugger;
    var nsrApprovedPrivilage = new Array("Pricing Analyst", "TSC", "Pricing Team manager", "TSC Manager", "Sales Manager - Direct", "Sales Manager - Telesales", "Sales Manager - Winback", "General Manager - Direct", "TSM");
    for (var j = 0; j < nsrApprovedPrivilage.length; j++) {
        var id = GetRoleIdByName(allsecurityRoles, nsrApprovedPrivilage[j]);
        var currentUserRoles = Xrm.Page.context.getUserRoles();
        for (var i = 0; i < currentUserRoles.length; i++) {
            var userRole = currentUserRoles[i];
            if (GuidsAreEqual(userRole, id)) {
                return true;
            }
        }
    }
   return false;
}

function GetRequestObject() {
    if (window.XMLHttpRequest) {
        return new window.XMLHttpRequest;
    }
    else {
        try {
            return new ActiveXObject("MSXML2.XMLHTTP.3.0");
        }
        catch (ex) {
            return null;
        }
    }
}

function GuidsAreEqual(guid1, guid2) {
    var isEqual = false;

    if (guid1 == null || guid2 == null) {
        isEqual = false;
    }
    else {
        isEqual = guid1.replace(/[{}]/g, "").toLowerCase() == guid2.replace(/[{}]/g, "").toLowerCase();
    }

    return isEqual;
}



function CheckIfUserCanApprove() {
    debugger;
    var hasPrivilagesToApprove = UserHasRole(GetAllSystemRoles());
    if (hasPrivilagesToApprove) {
        alert("hasPrivilagesToApprove");
    }
    else {
        alert("does not have hasPrivilagesToApprove");
    }
}


Add the list of security roles in nsrApprovedPrivilage array to check if user has that particular role