libraries/tbs/plugins/tbs_plugin_opentbs.php
function Misc_CellRef($Col, $Row) {
		$r = '';
		$x = $Col;
		do {
			$x = $x - 1;
			$c = ($x % 26);
			$x = ($x - $c)/26;
			$r = chr(65 + $c) . $r; // chr(65)='A'
		} while ($x>0);
		return $r.$Row;
	}
function Misc_CellRef($Col, $Row) {
		$r = '';
		$x = $Col;
		do {
			$x = $x - 1;
			$c = ($x % 26);
			$x = ($x - $c)/26;
			$r = chr(65 + $c) . $r; // chr(65)='A'
		} while ($x>0);
		return $r.$Row;
	}
Return the reference of the cell, such as 'A10'.