private function _writeBreaks()
	{
		// initialize
		$vbreaks = array();
		$hbreaks = array();

		foreach ($this->_phpSheet->getBreaks() as $cell => $breakType) {
			// Fetch coordinates
			$coordinates = PHPExcel_Cell::coordinateFromString($cell);

			// Decide what to do by the type of break
			switch ($breakType) {
				case PHPExcel_Worksheet::BREAK_COLUMN:
					// Add to list of vertical breaks
					$vbreaks[] = PHPExcel_Cell::columnIndexFromString($coordinates[0]) - 1;
					break;

				case PHPExcel_Worksheet::BREAK_ROW:
					// Add to list of horizontal breaks
					$hbreaks[] = $coordinates[1];
					break;

				case PHPExcel_Worksheet::BREAK_NONE:
				default:
					// Nothing to do
					break;
			}
		}

		//horizontal page breaks
		if (!empty($hbreaks)) {

			// Sort and filter array of page breaks
			sort($hbreaks, SORT_NUMERIC);
			if ($hbreaks[0] == 0) { // don't use first break if it's 0
				array_shift($hbreaks);
			}

			$record  = 0x001b;			   // Record identifier
			$cbrk	= count($hbreaks);	   // Number of page breaks
			$length  = 2 + 6 * $cbrk;	  // Bytes to follow

			$header  = pack("vv", $record, $length);
			$data	= pack("v",  $cbrk);

			// Append each page break
			foreach ($hbreaks as $hbreak) {
				$data .= pack("vvv", $hbreak, 0x0000, 0x00ff);
			}

			$this->_append($header . $data);
		}

		// vertical page breaks
		if (!empty($vbreaks)) {

			// 1000 vertical pagebreaks appears to be an internal Excel 5 limit.
			// It is slightly higher in Excel 97/200, approx. 1026
			$vbreaks = array_slice($vbreaks, 0, 1000);

			// Sort and filter array of page breaks
			sort($vbreaks, SORT_NUMERIC);
			if ($vbreaks[0] == 0) { // don't use first break if it's 0
				array_shift($vbreaks);
			}

			$record  = 0x001a;			   // Record identifier
			$cbrk	= count($vbreaks);	   // Number of page breaks
			$length  = 2 + 6 * $cbrk;	  // Bytes to follow

			$header  = pack("vv",  $record, $length);
			$data	= pack("v",   $cbrk);

			// Append each page break
			foreach ($vbreaks as $vbreak) {
				$data .= pack("vvv", $vbreak, 0x0000, 0xffff);
			}

			$this->_append($header . $data);
		}
	}