radio 过滤解决办法 _JavaScript

radio 过滤
HTML code

<form name='form1' id="form1" method="post">
<table width="90%"  border="0" align="center" >  
  <tr>
      <td height="10" style="color:#FF0000 " >显示器：</td>
    <td height="10" style="color:#FF0000 ">
        <input type="radio" name="6" value="有"  onChange="change()" >有<input type="radio" name="6" value="无" onChange="change()" checked>无<input type="radio" name="6" value="未知"  onChange="change()" >未知</td>
    <td height="10" style="color:#000000 " >鼠标：</td>
    <td height="10" style="color:#000000 ">
        <input type="radio" name="3" value="有"  onChange="change()" >有<input type="radio" name="3" value="无" onChange="change()" checked>无<input type="radio" name="3" value="未知"  onChange="change()" >未知</td></tr>
<tr>
    <td height="10" style="color:#FF0000 " >键盘：</td>
    <td height="10" style="color:#FF0000 ">
        <input type="radio" name="4" value="有"  onChange="change()" >有<input type="radio" name="4" value="无" onChange="change()" checked>无<input type="radio" name="4" value="未知"  onChange="change()" >未知</td>
    <td height="10" style="color:#000000 " >椅子：</td>
    <td height="10" style="color:#000000 ">
        <input type="radio" name="7" value="有"  onChange="change()" >有<input type="radio" name="7" value="无" onChange="change()" checked>无<input type="radio" name="7" value="未知"  onChange="change()" >未知</td></tr>
<tr>
    <td height="10" style="color:#000000 " >电源：</td>
    <td height="10" style="color:#000000 ">
        <input type="radio" name="8" value="有"  onChange="change()" >有<input type="radio" name="8" value="无" onChange="change()" checked>无<input type="radio" name="8" value="未知"  onChange="change()" >未知</td>
    <td height="10" style="color:#000000 " >鼻息肉：</td>
    <td height="10" style="color:#000000 ">
        <input type="radio" name="9" value="有"  onChange="change()" >有<input type="radio" name="9" value="无" onChange="change()" checked>无<input type="radio" name="9" value="未知"  onChange="change()" >未知</td></tr>
<tr>
    <td height="10" style="color:#FF0000 " >网络：</td>
    <td height="10" style="color:#FF0000 ">
        <input type="radio" name="10" value="有"  onChange="change()" >有<input type="radio" name="10" value="无" onChange="change()" checked>无<input type="radio" name="10" value="未知"  onChange="change()" >未知</td></tr>
<tr><td height="40" colspan="4"  align="center"><br>
    <input name="test" type="button"  id="btn"  value="下一步"  onclick="test();" > 
    <input name="close" type="reset"  value="重新输入"  id="btn">
   </td> </tr>
</table>
</form>