codice:
function generateRandom(num)
{
	var l = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890", r = "";
	for(var i = 0; i < num; i++){
		r += l.substr(Math.round(Math.random() * l.length), 1);
	}
	return r;
}
trace(generateRandom(5))
trace(generateRandom(5))
trace(generateRandom(5))