allow multiple select on radio button in html
<fieldset>
<legend>Please select one of the following</legend>
<input type="radio" name="action" id="track" value="track" /><label for="track">Track Submission</label><br />
<input type="radio" name="action" id="event" value="event" /><label for="event">Events and Artist booking</label><br />
<input type="radio" name="action" id="message" value="message" /><label for="message">Message us</label><br />
</fieldset>