/**
  * This class implements the Singleton pattern. There is only ever
  * one instance of the this class and it is accessed only via the 
  * ClassName::instance() method.
  * 
  * @return object 
  * @access public
  * @since 5/26/05
  * @static
  */
 public static function instance()
 {
     if (!isset(self::$instance)) {
         self::$instance = new ConcertoErrorPrinter();
     }
     return self::$instance;
 }