javascript radio buttons??

[role]

why this stupid javascript always alert "Undefined"?!?!?!
how to get radio buttons checked value???

<script language="javascript">
<!--
function isVote() {
alert(document.rating_form.rating.value);
if (document.rating_form.rating.value == "Nice") {
alert("Under Construction...");
}
return false;
}
// -->
</script>

<form name="rating_form" method="post" action="../menu.html" onSubmit="return

isVote()">
<input type="radio" name="rating" value="Excellent" />Excellent<br />
<input type="radio" name="rating" value="Nice" />Nice<br />
<input type="radio" name="rating" value="Awful" />Awful<br />
<button type="submit">vote
</form>

[Jona]

<script type="text/javascript">
<!--
function isVote() {
for(i=0; i<document.rating_form.rating.length; i++){
if(document.rating_form.rating[i].checked && document.rating_form.rating[i].value == "Nice") {
alert("Under Construction...");
return false;
}
if(document.rating_form.rating[i].checked){
alert(document.rating_form.rating[i].value);}
}
return false;
}
// -->
</script>

<form name="rating_form" method="post" action="../menu.php" onSubmit="return isVote()">
<input type="radio" name="rating" value="Excellent" />Excellent<br />
<input type="radio" name="rating" value="Nice" />Nice<br />
<input type="radio" name="rating" value="Awful" />Awful<br />
<button type="submit">vote</button>
</form>


[J]ona