请问 怎么实现jsp中的table框中的数据鼠标移到其中一行时 显示设置按钮 ，移开时按钮隐藏
<tbody>
<s:iterator value="addressDTOList" var="list">
<tr style=" border-bottom:#CCC 1px dashed;text-align:center;">
<td><s:textfield name="id" id="id" </s:textfield></td>
<td><s:textfield name="receiver" id="receiver" </s:textfield></td>
<td><s:textfield name="address" id="address"></s:textfield></select></td>
<td><s:textfield name="mobile" id="mobile" ></s:textfield></td>
<td ><a href="default.action?">设置</a></td>
</tr>
</s:iterator>
</tbody>
------解决思路----------------------
<tbody>
<s:iterator value="addressDTOList" var="list">
<tr style=" border-bottom:#CCC 1px dashed;text-align:center;" onmouseover="this.getElementsByTagName('a')[0].style.display='block'" onmouseout="this.getElementsByTagName('a')[0].style.display='none'">
<td><s:textfield name="id" id="id" </s:textfield></td>
<td><s:textfield name="receiver" id="receiver" </s:textfield></td>
<td><s:textfield name="address" id="address"></s:textfield></select></td>
<td><s:textfield name="mobile" id="mobile" ></s:textfield></td>
<td ><a href="default.action?">设置</a></td>
</tr>
</s:iterator>
</tbody>