<input id="rating-5" name="rating" type="radio" value="1" />
<input id="rating-5" name="rating" type="radio" value="2" />
<input id="rating-5" name="rating" type="radio" value="3" />
<input id="rating-5" name="rating" type="radio" value="4" />
<input id="rating-5" name="rating" type="radio" value="5" />
<script>
var y = $(':radio[name="rating"]:checked').val() ;
alert(y);
</script>