<form method="post" id="color_send">
<label><input type="radio" name="color" value="1" /> красный</label>
<label><input type="radio" name="color" value="2" /> черный</label>
<input type="submit" name="send" value="Отправить" />
</form>
<script>
$(function () {
$('#color_send').submit(function () {
$.post('/send.php', $(this).serialize());
return false;
});
});
</script>