code: 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;
  	}
docs: Return the reference of the cell, such as 'A10'.