function chooseHavePassword() {
	val = $('login_have_password_true').checked;
	password = $('login_password');
	password.value = "";
	
	if (val) {
		password.disabled = false;
		password.focus();
	} else {
		password.disabled = true;
	}
}

function emailKeyPressListener(event) {
	if (event.keyCode == 9) {
		$('login_have_password_true').checked = true;
		chooseHavePassword();
		Event.stop(event);
	}
}

Event.observe(window, 'load', function () {
        chooseHavePassword();
	$('login_have_password_true').observe('change', chooseHavePassword);
	$('login_have_password_false').observe('change', chooseHavePassword);
	$('login_email').observe('keydown', emailKeyPressListener);
});