function createCellPos(n) {
	var ordA = 'A'.charCodeAt(0);
	var ordZ = 'Z'.charCodeAt(0);
	var len = ordZ - ordA + 1;
	var s = '';

	while (n >= 0) {
		s = String.fromCharCode((n % len) + ordA) + s;
		n = Math.floor(n / len) - 1;
	}

	return s;
}
Convert from numeric position to letter for column names in Excel
@param  {int} n Column number
@return {string} Column letter(s) name