关于下拉菜单的问题?
<td height="28">
<span class="style7">送给:</span>
<span class="style9">
<input type="radio" name="radiobutton" value="radiobutton">朋友
<input type="radio" name="radiobutton" value="radiobutton">恋人
<input type="radio" name="radiobutton" value="radiobutton">死党
<input type="radio" name="radiobutton" value="radiobutton">亲人
<input type="radio" name="radiobutton" value="radiobutton">祝福
<input type="radio" name="radiobutton" value="radiobutton">道歉
<input type="radio" name="radiobutton" value="radiobutton">同事 </span>
</td>
<td height="28"> </td>
</tr>
<tr>
<td width="85" height="28"> </td>
<td height="28"><span class="style7">对他/她说: </span> <select name="select" class="biaoji" >
<option >节日快乐身体健康</option>
</select>
我想让这个下拉框,能根据上面的单选按钮来控制,单选按钮选的不同,下拉框里面可选的内容就不同。