Scrollable list...

Hi guys,
i've a question for you.
I'm developing a jsf application,i have a login page in which the user
has tree fields to insert, a login(free text), a password(free text)
and a team.
I want the user can choices team(student or worker) from a scrollable
list of two values.
How can realize this scrollable list?
Can you help me with code?
The form have to be authenticated by this action method called by
backing bean.
My doubles are about how can submit the value selected from the
2values-list(selectOneMenu i think..) to authenticationBean.
Please help me,i need your help because google hasn't helped
me..thanks...can you help me with simple code?
Thanks very much

public class AuthenticationBean extends BaseBean {
    /**
     *
     */
    private static final long serialVersionUID = 1;

    private String loginName;

    private String password;

    private String teamName;

    boolean registered;

    public AuthenticationBean() {
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    public String getLoginName() {
        return loginName;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPassword() {
        return password;
    }

    public void setTeamName(String teamName) {
        this.teamName = teamName;
    }

    public String getTeamName() {
        return teamName;
    }

public String login(){
    String risultato=null;
    try{
        DataSource dataSource=Singleton.getInstance().getDataSource();
        Connection connection=dataSource.getConnection();
        if (connection != null) {
                    Statement statm = connection.createStatement();
                    String query = "SELECT * FROM user " + "WHERE username = '"
                            + loginName + "' " + "AND password = '" + password
                            + "' " + "AND teamname ='" + teamName + "'";
                    ResultSet rs = statm.executeQuery(query);
                    registered = false;
                    if (rs.next()) {
                        registered = true;
                                                connection.close();
                        risultato="login";
                    }
                    else risultato="failure";
                }
            

        }