function _writeUrlInternal($row1, $col1, $row2, $col2, $url)
	{
		$record	  = 0x01B8;					   // Record identifier
		$length	  = 0x00000;					  // Bytes to follow

		// Strip URL type
		$url = preg_replace('/^internal:/', '', $url);

		// Pack the undocumented parts of the hyperlink stream
		$unknown1	= pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");

		// Pack the option flags
		$options	 = pack("V", 0x08);

		// Convert the URL type and to a null terminated wchar string
		$url .= "\0";

		// character count
		$url_len = PHPExcel_Shared_String::CountCharacters($url);
		$url_len = pack('V', $url_len);

		$url = PHPExcel_Shared_String::ConvertEncoding($url, 'UTF-16LE', 'UTF-8');

		// Calculate the data length
		$length	  = 0x24 + strlen($url);

		// Pack the header data
		$header	  = pack("vv",   $record, $length);
		$data		= pack("vvvv", $row1, $row2, $col1, $col2);

		// Write the packed data
		$this->_append($header . $data .
					   $unknown1 . $options .
					   $url_len . $url);
		return 0;
	}