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The radio button and inputs for file and URL upload have the same IDs.

<table id="mw-htmlform-source">
    <tbody>
        <tr class="mw-htmlform-field-UploadSourceField">
            <td class="mw-label">
                <label for="wpUploadFile">Source file:</label>
                <input name="wpSourceType" type="radio" id="wpUploadFile" value="File" checked="">
            </td>
            <td class="mw-input">
                <input id="wpUploadFile" name="wpUploadFile" size="60" type="file">
            </td>
        </tr>
        <tr class="mw-htmlform-field-UploadSourceField">
            <td class="mw-label">
                <label for="wpUploadFileURL">Source URL:</label>
                <input name="wpSourceType" type="radio" id="wpUploadFileURL" value="url">
            </td>
            <td class="mw-input">
                <input id="wpUploadFileURL" name="wpUploadFileURL" size="60">
            </td>
        </tr>
    </tbody>
</table>

Not sure if this intended but the radios uses to have the ids wpSourceTypeurl and wpSourceTypeFile.