ASP.NET

function onAddUser(e){
        var email = $get("<%= txtUserEmail.ClientID %>").value;
        var password = $get("<%= txtPassword.ClientID %>").value;
        var firstName = $get("<%= txtFirst.ClientID %>").value;
        var lastName = $get("<%= txtLast.ClientID %>").value;
        var address1 = $get("<%= txtAddress1.ClientID %>").value;
        var address2 = $get("<%= txtAddress2.ClientID %>").value;
        var city = $get("<%= txtCity.ClientID %>").value;
        var state = $get("<%= ddlState.ClientID %>").value;
        var zip = $get("<%= txtZip.ClientID %>").value;
        var parentElement = e.target.parentNode;

    PersonalWebSite1.UserService.WriteUser(email, password, firstName, lastName, address1, address2,
        city, state, zip, onWriteUserSuccess, onWriteUserFailure, parentElement);

    //Note normally returning false from the event handler code works
    //but for some reason in the latest version of FireFox it does not
    //so preventDefault is used
    e.preventDefault();
    return false;
}