This form allows a customer to choose a shipping option. While it
submits the form, no matter which button is selected, the same value
is always submitted.
Thanks for any help.

The code:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
<script language="JavaScript" type="text/javascript">
function Ship_Option(Form, Value) {
Form.service.value = Value;
Form.submit();
}
</script>

<form method="post" action="ship.html">
<input type="radio" name="service" value="9"
onfocus="Ship_Option(this.form, 9)">UPS Ground<br>
<input type="radio" name="service" value="10"
onfocus="Ship_Option(this.form, 10)">UPS 3 Day Select<br>
<input type="radio" name="service" value="11"
onfocus="Ship_Option(this.form, 11)">UPS 2 Day Air
</form>