[iNils]

function group (num, char) {
	var str:String = String (num);
	var mod:Number = str.length % 3;
	var len:Number = (str.length - mod) / 3;
	if (mod == 0) {
		var i:Number = 1;
		var strOutput:String = str.substr (0, 3);
	} else {
		var i:Number = 0;
		var strOutput:String = str.substr (0, mod);
	}
	for (; i < len; i++) {
		strOutput += char + str.substr (i * 3 + mod, 3);
	}
	return strOutput;
}
trace (group (1, "'"));
trace (group (12, "'"));
trace (group (123, "'"));
trace (group (1234, "'"));
trace (group (12345, "'"));
trace (group (123456, "'"));
trace (group (1234567, "'"));
trace (group (12345678, "'"));
trace (group (123456789, "'"));
trace (group (1234567890, "'"));