Check Multi Roles User in MSCRM Form Load

function GetCurrentUserRole()
{
    var roles = Xrm.Page.context.getUserRoles();

    for (var i = 0; i < roles.length; i++) {
        GetRole(roles[i]);
    }
}

function GetRole(roleid) {
    var serverUrl = Xrm.Page.context.getClientUrl();
    var oDataSelect = serverUrl + "/XRMServices/2011/OrganizationData.svc/RoleSet?$select=Name&$filter=RoleId eq guid'" + roleid + "'";

    var retrieveReq = new XMLHttpRequest();
    retrieveReq.open("GET", oDataSelect, false);
    retrieveReq.setRequestHeader("Accept", "application/json");
    retrieveReq.setRequestHeader("Content-Type", "application/json;charset=utf-8");
    retrieveReq.onreadystatechange = function () {
        GetRoleData(this);
    };
    retrieveReq.send();
}

function GetRoleData(retrieveReq) {
    if (retrieveReq.readyState == 4) {
        if (retrieveReq.status == 200) {
            var retrieved = JSON.parse(retrieveReq.responseText).d;
            var roleName = retrieved.results[0].Name;
            if(roleName!='Sales Manager' && roleName!='System Administrator' && roleName!='System Customizer')
              {
               Xrm.Page.getControl("new_status").setDisabled(true);
               Xrm.Page.getControl("new_commentsforrejection").setDisabled(true);
              }
          else
           {
               Xrm.Page.getControl("new_status").setDisabled(false);
               Xrm.Page.getControl("new_commentsforrejection").setDisabled(false);
           }
            //alert(retrieved.results[0].Name);
        }
    }
}