gistfile1.js

function spreadsheetHeaderArray(length) {
	var i, result = [], characters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
	for (i = 0; i < length; i += 1) {
		result[i] = (i > 25) ? result[i - 26] + characters[i % 26] : characters[i % 26];
	}
	return result;
}