<script language="javascript">
var i=1
function aa()
{
var obj=document.formna.test
obj.options.add(new Option(i,1,true,true));
window.alert("第"+obj.selectedIndex+"个")
i++;
}
function del()
{
var obj=document.all.test
obj.options.remove(obj.selectedIndex);
window.alert("删第"+parseInt(obj.selectedIndex+1)+"个")
obj.options[0].selected=true;
}
</script>
<%%><form name="formna" action="" method="post" >
<select name="test" onchange="javascript:aa()">
<option value="2" >b</option>
<option value="3" >c</option>
</select>
<input type="button" name="dele" value="删除" onclick="javascript:del()">
</form>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>New Page 1</title>
</head><body><table border="1" >
<tr>
<td ><input type=radio name=aaa checked onclick="document.all.text001.disabled=false;document.all.select001.disabled=document.all.select002.disabled=true;"> </td>
<td ><input name=text001 style="width:200"> </td>
</tr>
<tr>
<td ><input type=radio name=aaa onclick="document.all.text001.disabled=true;document.all.select001.disabled=document.all.select002.disabled=false;"> </td>
<td >
<select name=select001 disabled style="width:200"></select>
<select name=select002 disabled style="width:200"></select>
</td>
</tr>
</table>
<br>
<br><table border="1" >
<tr>
<td ><input type=radio name=bbb checked onclick="document.all.text101.disabled=false;document.all.select101.disabled=document.all.select102.disabled=true;"> </td>
<td ><input name=text101 style="width:200"> </td>
</tr>
<tr>
<td ><input type=radio name=bbb onclick="document.all.text101.disabled=true;document.all.select101.disabled=document.all.select102.disabled=false;"> </td>
<td >
<select name=select101 disabled style="width:200"></select>
<select name=select102 disabled style="width:200"></select>
</td>
</tr>
</table>
</body></html>