JS怎样实现左右两侧菜单添加与移除

 function toRight(l, r, v) {
 $("#" + l + " option:selected").appendTo("#" + r);
 $("#" + l + " option:selected").remove();
 var str = $("#" + l + " option").map(function () { return $(this).val(); }).get().join(", ")
 $("#" + v).val(str);
 }
 function allToRight(l, r, v) {
 $("#" + l + " option").appendTo("#" + r);
 $("#" + l + " option").remove();
 var str = $("#" + l + " option").map(function () { return $(this).val(); }).get().join(", ")
 $("#" + v).val(str);
 }
 function toLeft(l, r, v) {
 $("#" + r + " option:selected").appendTo("#" + l);
 $("#" + r + " option:selected").remove();
 var str = $("#" + l + " option").map(function () { return $(this).val(); }).get().join(", ")
 $("#" + v).val(str);
 }
 function allToLeft(l, r, v) {
 $("#" + r + " option").appendTo("#" + l);
 $("#" + r + " option").remove();
 var str = $("#" + l + " option").map(function () { return $(this).val(); }).get().join(", ")
 $("#" + v).val(str);
 }

<p class="easyui-layout" data-options="fit:true">
 <p data-options="region:'west',split:false" style="width:40%;padding:0px">
 <h3 style="padding:5px; border-bottom:1px solid #DDDDDD;">::已授权权限::</h3>
 <p data-options="region:'center'" style="padding:3px; height:215px;" border="false">
 <select multiple="multiple" id="menuFunc" style="width:100%;height:100%">
 </select>
 <input type="hidden" name="func" id="func" value="" />
 </p>
 </p>
 <p data-options="region:'east'" style="width:40%;padding:0px">
 <h3 style="padding:5px;border-bottom:1px solid #DDDDDD;">::未授权权限::</h3>
 <p data-options="region:'center'" style="padding:3px; height:215px;" border="false">
 <select multiple="multiple" id="menuFuncBase" style="width:100%;height:100%">
 </select>
 </p>
 </p>
 <p data-options="region:'center'" style="padding:40px; width: 197px; height:230px;line-height:40px; text-align:center;"> 
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="button button-primary button-rounded button-small" onclick="toLeft('menuFunc','menuFuncBase','func')" > < </a><br />
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="button button-primary button-rounded button-small" onclick="allToLeft('menuFunc','menuFuncBase','func')" ><<</a><br /> 
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="button button-caution button-rounded button-small" onclick="toRight('menuFunc','menuFuncBase','func')" > > </a><br />
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="button button-caution button-rounded button-small" onclick="allToRight('menuFunc','menuFuncBase','func')">>></a><br /> 
 </p>
 </p>