jquery的treeview插件使用问题


希望大家能给一个关于该插件的使用说明地址我的问题其实也是由于没有使用说明造成的, 请看问题:
//--------源码-------------:
    <script type="text/javascript">
             //填充树: node 被填充的节点, pid 节点ID(数据库中的ID字段)
    function filltree(node,pid)
    {
        $.ajax({
            url:"Ajax/power.ashx?"+Math.random(),
            data:{opertype:"getlist",id:pid},
            beforeSend:function(){
            },
            success:function(data){
                var json = eval('('+data+')');  
                //删除空节点
                node.children("ul").eq(0).remove();           
                
                $.each(json,function(i,item){                   
                    var str = "<li id='"+item['id']+"'><span class='folder' >"+item['name']+"</span>";
                if(item['haschild']=="True")
                {
                    str +="<ul class='null'><li><span class='file'></span></li></ul>";
                }
                str +="</li>";
            var newnode = $(str).appendTo(node);
                node.treeview({
                add: newnode
                });
                });                              
            }
        });
    }
        
        $(document).ready(function(){
                      
                      $("#red").treeview({
        animated: "fast",
        collapsed: true, 
        unique: false,
        persist: "cookie",
        toggle: function() {
                             if($(this).children("ul").eq(0).attr("class")=="null") 
                             {
                                filltree($(this),$(this).attr("id"));
                                alert("in");
                             }
                             window.console && console.log("%o was toggled", this);
                          }
        });         
        //初次加载(顶级)节点
        filltree($("#red"),0);                });    
    </script>    <body>
<ul id="red" class="treeview-red"> </ul>
</body>
//--------问题描述-------------:
当我在filltree函数里写上删除节点的代码 "node.children("ul").eq(0).remove();" 后
奇怪的事情就发生了: 展开和折叠事件就不触发了请问: 如何正确地删除节点, 避免上述情况的发生?