public function showcerts($id = null)
 {
     $certs = Certificate::all();
     $title = 'Vehicle Certificates';
     if (is_numeric($id)) {
         $certs = Certificate::where('status', $id)->get();
         $title = $id == 1 ? 'Approved Vehicle Certificates' : 'Unapproved Vehicle Certificates';
     }
     return View::make('vehicles.certificates')->with('certificates', $certs)->with('title', $title);
 }