Edit in JSFiddle

$('input[name=reg]').change(function() {
    switch ($('input[name=reg]:checked').val()) {
    case 'hagh':
        $('#labelMsgForRadioClick').text('first radio was clicked');
        break;
    case 'hogh':
        $('#labelMsgForRadioClick').text('second radio was clicked');
        break;
    default:
        $('#labelMsgForRadioClick').text('select your choice');
    }
});

<table>
    <tr>
        <td colspan="2">
            <span id="labelMsgForRadioClick">Select your choice</span>
        </td></tr>
 <tr>
                <td>
                    <input type="radio" value="hagh" checked="checked" name="reg">حقیقی</input>
                </td>
                <td>
                    <input type="radio" value="hogh" name="reg">حقوقی</input>
                </td>
            </tr>
</table>