// JavaScript Document
function conferma() {
	if(window.confirm("Sei sicuro?")) {
		return true;
	}
	else {
  	return false;
	}
}

function controlla_login() {
	var user = cont_User(document.login_form.user.value);
	var pass = cont_Pass(document.login_form.password.value);
	var msg = "";
	if ( !user ) msg += "Wrong Username format\n";
	if ( !pass ) msg += "Wrong Password format\n";
	if ( msg != "" ) {
		msg = "Warning:\n\n" + msg;
		window.alert(msg);
	}
	return ( user && pass );
}

function cont_User(user) {
	var userpattern = /^[a-zA-Z0-9_.]{3,10}$/;
	var control = user.search(userpattern);
	if ( user.length == 0 ) {
		return false;
	}
	else {
		if ( control != 0 ) {
			return false;
		}
		else {
			return true;
		}
	}
}

function cont_Pass(pass1) {
	var patternpwd = /^[a-zA-Z0-9_.]{3,20}$/;
	var control1 = pass1.search(patternpwd);
	if ( control1 != 0 ) {
		return false;
	}
	else {
		return true;
	}
}