radio button on change event

How to use radio button on change event?

HTML code-sample

<fieldset>
    <legend>Search Options</legend>
    <input type="radio" name="Search" value="1" checked="checked" /> TextBox1
    <input type="radio" name="Search" value="2" /> TextBox2
    <input type="radio" name="Search" value="3" /> TextBox3
</fieldset>


JavaScript  code-sample

function searchSection(evt) {
        var val = $("input[name=Search]:checked").val();

        if (val == '1') {
            $('#1').show();
        } else if (val == '2') {
            $('#2').show();
        } else if (val == '3') {
            $('#3').show();
        }
 }

$('input[name=Search]:radio').change(searchSection);



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