submit a form with no button?

[netfrugal]

I would like to submit a form with only 2 radio buttons: On / Off

Is there a way to submit the form when I click one of the radio buttons, and not a submit button?

[eriksmoen]

<input type='radio' name='radio1' onclick='this.form.submit();'>

[netfrugal]

I knew it would be easy! thanks!