如何实现如下功能

PHP代码:--------------------------------------------------------------------------------
脚本说明:
把如下代码加入区域中

请选择
第一项
第二项
第三项
第四项
第五项
第六项

你可以自己选择一下:

<br><br>PHP代码:--------------------------------------------------------------------------------<br>脚本说明:<br>把如下代码加入区域中<br><br><table align="center"> <br><tr><td> <br><form name="main_form" action="" method="post"> <input type="hidden" name="AddAdmins"><br><input type="hidden" name="RemoveAdmins"><input type="hidden" name="AddUsers"><input>type=hidden name=RemoveUsers><br><div align="center"> <br><table cellspacing="0" cellpadding="5" border="0"> <br><tbody> <br><tr> <br><td valign="top" align="middle" rowspan="2">备选用户<br><select multiple size="12" name="Employees"><br><option>Employee_01</option> <option>Employee_02</option> <option>Employee_03</option> <option>Employee_04</option> <option>Employee_05</option> <option>Employee_06</option> <option>Employee_07</option> <option>Employee_08</option> <option>Employee_09</option> <option>Employee_10</option></select><br> </td> <br><td> <br><p align="center"><input onclick="MoveOption('Employees','Admins','Add');" type="button" value="增加Admin >>" name="add_admin"><br></p> <br><p align="center"><input onclick="MoveOption('Admins','Employees','Remove');" type="button" value="<< 删除Admin" name="remove_admin"><br></p> </td> <br><td valign="top" align="middle">Administrators<br><select multiple size="5" name="Admins"><br><option>Admin_01</option> <option>Admin_02</option> <option>Admin_03</option> <option>Admin_04</option> <option>Admin_05</option></select><br> </td> </tr> <br><tr> <br><td> <br><p align="center"><input onclick="MoveOption('Employees','Users','Add');" type="button" value="增加User >> " name="add_user"><br></p> <br><p align="center"><input onclick="MoveOption('Users','Employees','Remove');" type="button" value=" << 删除User " name="remove_user"><br></p> </td> <br><td valign="top" align="middle">Users<br><select multiple size="5" name="Users"><br><option>User_01</option> <option>User_02</option> <option>User_03</option> <option>User_04</option> <option>User_05</option></select><br> </td> </tr> <br> </tbody> <br> </table> <br> </div> <br> </form> <br> </td></tr> <br><tr><td> <br><div align="center"><input onclick="LockChanges();" type="button" value="保存修改"></div> <br><br><br><div align="center"> <br><a href="/default/index/url?u=aHR0cHM6Ly93d3cucGhwLmNuamF2YSBzY3JpcHQ6YWxlcnQoZG9jdW1lbnQubWFpbl9mb3JtLkFkZEFkbWlucy52YWx1ZSk7" target="_blank" rel="nofollow">查询增加的Admin</a><br><br><br><a href="/default/index/url?u=aHR0cHM6Ly93d3cucGhwLmNuamF2YSBzY3JpcHQ6YWxlcnQoZG9jdW1lbnQubWFpbl9mb3JtLlJlbW92ZUFkbWlucy52YWx1ZSk7" target="_blank" rel="nofollow">查询删除的Admin</a><br><br><br><a href="/default/index/url?u=aHR0cHM6Ly93d3cucGhwLmNuamF2YSBzY3JpcHQ6YWxlcnQoZG9jdW1lbnQubWFpbl9mb3JtLkFkZFVzZXJzLnZhbHVlKTs=" target="_blank" rel="nofollow">查询增加的User</a><br><br><br><a href="/default/index/url?u=aHR0cHM6Ly93d3cucGhwLmNuamF2YSBzY3JpcHQ6YWxlcnQoZG9jdW1lbnQubWFpbl9mb3JtLlJlbW92ZVVzZXJzLnZhbHVlKTs=" target="_blank" rel="nofollow">查询删除的User</a><br> </div> <br> </td></tr> <br><br> </table> <br><br><br>PHP代码:--------------------------------------------------------------------------------<br>脚本说明：<br>把如下代码加入区域中:<br><br><br><form action="" method="POST"> <br><table border="0"> <br><tr> <br><td><select multiple size="5" name="list1"><br><option value="11"> item 1.1 </option> <br><option value="12"> item 1.2 </option> <br><option value="13"> item 1.3 </option> <br></select></td> <br><td> <br><input type="button" value=" >> " onclick="move(this.form.list1,this.form.list2)" name="B1"><br><br><input type="button" value=" << " onclick="move(this.form.list2,this.form.list1)" name="B2"><br> </td> <br><td><select multiple size="5" name="list2"><br><option value="21"> item 2.1 </option> <br><option value="22"> item 2.2 </option> <br><option value="23"> item 2.3 </option> <br></select></td> <br> </tr> <br> </table> <br> </form> <br><center> </center> <p style="width:100%;text-align:center;margin:10px 0"> <br><br></p> <p style="width:100%;text-align:center;margin:10px 0"> </p> <p class="clear"></p>