P</td>
<td>
<input type="CHECKBOX" name="sample17" onClick="doCheck(this)">
Q</td>
<td>
<input type="CHECKBOX" name="sample18" onClick="doCheck(this)">
R</td>
</tr>
</table>
</form>
</body>
</html>
<div style="position: absolute; top: 10; right: 10; width: 148; height: 18;cursor:hand">
<input type="button" name="Button" value="查看源代码" onClick= 'window.location = "view-source:" + window.location.href'></div>
