Ok i'll help you out a little bit more:
function SigninForm(){
$form = new Form(
$this,
"SigninForm",
new FieldSet(
$email = new TextField("Email", _t('CustomLoginForm.ENTEREMAIL')),
$password = new PasswordField("password", _t('CustomLoginForm.ENTERPASSWORD', 'Enter Password'))
),
new FieldSet(
$dosignin = new FormAction("doLogin", _t("CustomLoginForm.SIGNINBUTTON", "Sign In"))
),
new RequiredFields(
array(
'password'
)
)
);
return $form;
}