function extractstring($str, $start, $end) {
		$pos_start = strpos($str, $start);
		$pos_end = strpos($str, $end, ($pos_start + strlen($start)));
		if ( ($pos_start !== false) && ($pos_end !== false) ) {
		$pos1 = $pos_start + strlen($start);
		$pos2 = $pos_end - $pos1;
		return substr($str, $pos1, $pos2);
		}
	}