static function Start($level = null)
	{
		
		if ($level == null) 
		{
			if (defined("E_DEPRECATED"))
			{
				$level = E_ALL & ~E_DEPRECATED ;
			}
			else
			{
				// php 5.2 and earlier don't support E_DEPRECATED
				$level = E_ALL;
				self::$IGNORE_DEPRECATED = true;
			}
		}
		set_error_handler(array("ExceptionThrower", "HandleError"), $level);
	}