[iNils]

Использовать такую функцию

function fullLength (number, len, char) {
	var str = String (number);
	var preffix = "";
	if (str.length < len) {
		for (var i = 0; i < len - str.length; i++) {
			preffix += char;
		}
	}
	return preffix + str;
}
trace (fullLength (1, 4, "-"));
trace (fullLength (1, 3, "0"));
trace (fullLength (1, 2, "0"));
trace (fullLength (1, 1, "-"));
trace (fullLength (10000, 4, "-"));