JQuery ListBox间移动和ListBox内上下移动

代码

            var $btnUp = $('#ChooseUserControl1_btnUp');
            var $btnDown = $('#ChooseUserControl1_btnDown');
            
            
            
            //选择的联系人上下移动///////////////////////////////////
            $btnUp.click(function()
            {
                $lbSelLinkMan.find('option:selected').each(function(index, item)
                {         
                    ListBox_Order('up'); 
                });
                return false;
            });
            $btnDown.click(function()
            {
                $lbSelLinkMan.find('option:selected').each(function(index, item)
                {
                    ListBox_Order('down');
                });
                return false;
            });
            function ListBox_Order(action)
            {                
                var size = $lbSelLinkMan.find('option').size();
                var selsize = $lbSelLinkMan.find('option:selected').size();
                
                if (size > 0 && selsize > 0)
                {                    
                    $lbSelLinkMan.find('option:selected').each(function(index, item)
                    {
                        if (action == "up")
                        {
                            $(item).prev().insertAfter($(item));
                            return false;
                        }
                        else if (action == "down")//down时选中多个连靠则操作没效果
                        {
                            $(item).next().insertBefore($(item));
                            return false;
                        }
                    })
                }
                return false;
            }