请问一下,这个页面在netscape中打开为什么不能实现单选
<table width="87%" border="1" cellspacing="0" cellpadding="0" align="" style="margin-left:10">
<thead>
<tr class=row1tr>
<td>Select</td>
<td>Coverage Period</td>
<td>From Date<br>(DD/MM/YYYY)</td>
<td>To Date<br>(DD/MM/YYYY)</td>
</tr>
</thead>
<tbody id="DataTable">
<tr ack="update" old_period="1" cannotDel="" firstPRrow="false" lastPRrow="false">
<td align=center><input type="radio" name="select" ></td>
<td align=center>1</td>
<td align=center nowrap><input type=text value="1" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="1" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="2004" size=4 style='text-align:right;background-color:menu' readonly maxlength=4></td>
<td align=center nowrap><input type=text onchange="changeDate(this)" value="31" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="3" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="2004" size=4 style='text-align:right' maxlength=4></td>
</tr>
<tr ack="update" old_period="2" cannotDel="" firstPRrow="false" lastPRrow="false">
<td align=center><input type="radio" name="select" ></td>
<td align=center>2</td>
<td align=center nowrap><input type=text value="1" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="4" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="2004" size=4 style='text-align:right;background-color:menu' readonly maxlength=4></td>
<td align=center nowrap><input type=text onchange="changeDate(this)" value="30" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="6" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="2004" size=4 style='text-align:right' maxlength=4></td>
</tr>
<tr ack="update" old_period="3" cannotDel="" firstPRrow="false" lastPRrow="false">
<td align=center><input type="radio" name="select" ></td>
<td align=center>3</td>
<td align=center nowrap><input type=text value="1" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="7" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="2004" size=4 style='text-align:right;background-color:menu' readonly maxlength=4></td>
<td align=center nowrap><input type=text onchange="changeDate(this)" value="30" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="9" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="2004" size=4 style='text-align:right' maxlength=4></td>
</tr>
<tr ack="update" old_period="4" cannotDel="" firstPRrow="false" lastPRrow="false">
<td align=center><input type="radio" name="select" ></td>
<td align=center>4</td>
<td align=center nowrap><input type=text value="1" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="10" size=2 style='text-align:right;background-color:menu' readonly maxlength=2>/<input type=text value="2004" size=4 style='text-align:right;background-color:menu' readonly maxlength=4></td>
<td align=center nowrap><input type=text onchange="changeDate(this)" value="31" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="12" size=2 style='text-align:right' maxlength=2>/<input type=text onchange="changeDate(this)" value="2004" size=4 style='text-align:right' maxlength=4></td>
</tr>
</tbody>
</table>