Ext建立动态树时出现的问题？

我用Ext建立动态树，在FF和IE刚开始显示正常，但逐渐显示下图的现象。

[img]http://www.iteye.com/upload/attachment/109699/b707ea8f-4baf-323d-ba10-e66efa97751d.bmp[/img]正常

[img]http://www.iteye.com/upload/attachment/109701/4a54b55f-36c4-3801-af37-14dadcb0c9e7.bmp[/img]节点左出现白框

[img]http://www.iteye.com/upload/attachment/109703/c349da0c-5a81-3ab6-9126-b6cdaeda990c.bmp[/img]逐渐增多

不知什么原因，请大家指点！

树的源码： tree.js

//------------- 井查询树的定义 -----------------
Ext.onReady(function(){

var welltree = new Ext.tree.TreePanel({
    el: 'west',
    autoScroll:true,
    animate:true,
    //默认根目录不显示
    rootVisible:false,
    border:false,
    animate:true,
    lines:true,
    enableDD:true,
    containerScroll:true,
    loader: new Ext.tree.TreeLoader({
        dataUrl: 'data.txt'
    })
}) ;

var root = new Ext.tree.AsyncTreeNode({text:'数据库数据'});
welltree.setRootNode(root) ;
welltree.render();
root.expand();

})

产生节点的数据文件 data.txt

[
{text:'辽河油田', children:[
{text:'兴隆台采油厂', children:[
{text:'兴区块', leaf: true},
{text:'马圈子区块', leaf: true},
{text:'开区块', leaf: true},
{text:'于区块', leaf: true},
{text:'双区块', leaf: true},
{text:'黄区块', leaf: true},
{text:'荣区块', leaf: true},
{text:'台区块', leaf: true}
]},
{text:'沈阳采油厂', children:[
{text:'曹区块', leaf: true},
{text:'法区块', leaf: true},
{text:'沈区块', leaf: true},
{text:'边台潜山区块', leaf: true},
{text:'大民屯', leaf: true},
{text:'前区块', leaf: true},
{text:'静区块', leaf: true},
{text:'长区块', leaf: true}
]},
{text:'欢喜岭采油厂', children:[
{text:'欢2块', leaf: true},
{text:'欢612块', leaf: true},
{text:'欢其它区块', leaf: true},
{text:'齐40块', leaf: true},
{text:'齐108块', leaf: true},
{text:'齐2块', leaf: true},
{text:'齐其它区块', leaf: true}
]}
]}
]

Ext.BLANK_IMAGE_URL = '../ext-3.0-rc1/resources/images/default/s.gif';

在Ext.onReady()中加上上面的代码,注意你自己的路径

图片路径问题，以前遇到过。

是图片路径的问题