radio button on change event

How to use radio button on change event?

HTML code-sample

    <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

JavaScript  code-sample

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

        if (val == '1') {
        } else if (val == '2') {
        } else if (val == '3') {


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