라디오버튼

<input type='radio' name='o' id='o' value='1'>one
<input type='radio' name='o' id='o' value='2'>two
<input type='radio' name='o' id='o' value='3'>three

$(document).readry(function() {
$("input[name=o]").click(function() {
    var oval = $(this).val();
    alert(oval);
});