javascript实现的左右选择框效果代码

<form action="" method="post"> <table border="0"><tr> <td><select multiple size="5" name="list1" style="width:250px"><option value="11"> item 1.1 </option> <option value="12"> item 1.2 </option> <option value="13"> item 1.3 </option></select></td> <td> <input type="button" value=" > " onclick="move(this.form.list1,this.form.list2)" name="b1"><input type="button" value=" < " onclick="move(this.form.list2,this.form.list1)" name="b2"><input type="button" value=" >> " onclick="moveall(this.form.list1,this.form.list2)" name="b3"><input type="button" value=" << " onclick="moveall(this.form.list2,this.form.list1)" name="b4"> </td> <td><select multiple size="5" name="list2" style="width:250px"><option value="21"> item 2.1 </option> <option value="22"> item 2.2 </option> <option value="23"> item 2.3 </option></select></td> </tr></table> </form>
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]