function checkSkypass(_skypass)
{		
	if (_skypass != null && _skypass != "")
	{ 
		if (_skypass.length != 9 && _skypass.length != 10)
		{ 
			return false;
		}
	}
	
	if (_skypass.substring(0,2).toUpperCase() != "BA" &&
		_skypass.substring(0,2).toUpperCase() != "BC" &&
		_skypass.substring(0,2).toUpperCase() != "BH" &&
		_skypass.substring(0,2).toUpperCase() != "BJ" &&
		_skypass.substring(0,2).toUpperCase() != "BK" &&
		_skypass.substring(0,2).toUpperCase() != "BU") 
	{ 	
		return false;
	}

	var skyNo = _skypass.substring(2);
	var skyDigit = skyNo.substring(skyNo.length-1);		

	if (skyDigit != (skyNo.substring(0, skyNo.length-1) % 9))
	{
		return false;
	}
	return true;
}