Ext.panel 显示图片有关问题

Ext.panel 显示图片问题

这个验证码为什么出不来呢？帮忙看看啊

JScript code

{                    xtype:'panel',                    layout:'column',                     bodyStyle:'background:transparent repeat-y 0 0',                                        border:false,                    anchor:"98%",                                      items:[{                        columnWidth:.6,                         border:false ,                                              xtype: 'form',                                                      defaultType:'textfield',                        bodyStyle:'background:transparent repeat-y 0 0',                        defaults:{                            anchor:'90%'                                                   },                        items:[{                                labelWidth:60,                                                     fieldLabel:"验证码",                                                      name:'validate',                            allowBlank:false,                            blankText: '验证码不能为空'                        }]                                                                  },{                            columnWidth:.4,                                           border:false,                        xtype:'panel',                        bodyStyle:'background:transparent repeat-y 0 0',                        height:23,                        width:100,                        anchor:'85%',                                                html:"<img src='action.aspx' width='80' height='25' alt=\"点击显示图片\"  />"                    }