function _convertError($errorCode)
    {
		switch ($errorCode) {
			case '#NULL!':	return pack("C", 0x00);
			case '#DIV/0!':	return pack("C", 0x07);
			case '#VALUE!':	return pack("C", 0x0F);
			case '#REF!':	return pack("C", 0x17);
			case '#NAME?':	return pack("C", 0x1D);
			case '#NUM!':	return pack("C", 0x24);
			case '#N/A':	return pack("C", 0x2A);
		}
		return pack("C", 0xFF);
    }
function _convertError($errorCode)
    {
		switch ($errorCode) {
			case '#NULL!':	return pack("C", 0x00);
			case '#DIV/0!':	return pack("C", 0x07);
			case '#VALUE!':	return pack("C", 0x0F);
			case '#REF!':	return pack("C", 0x17);
			case '#NAME?':	return pack("C", 0x1D);
			case '#NUM!':	return pack("C", 0x24);
			case '#N/A':	return pack("C", 0x2A);
		}
		return pack("C", 0xFF);
    }
function _convertError ( $ errorCode ) { switch ( $ errorCode ) { case '#NULL!' : return pack ( "C" , 0x00 ) ; case '#DIV/0!' : return pack ( "C" , 0x07 ) ; case '#VALUE!' : return pack ( "C" , 0x0F ) ; case '#REF!' : return pack ( "C" , 0x17 ) ; case '#NAME?' : return pack ( "C" , 0x1D ) ; case '#NUM!' : return pack ( "C" , 0x24 ) ; case '#N/A' : return pack ( "C" , 0x2A ) ; } return pack ( "C" , 0xFF ) ; }
Convert an error code to a ptgErr

@access	private
@param	string	$errorCode	The error code for conversion to its ptg value
@return	string				The error code ptgErr
Convert an error code to a ptgErr