EXT JS tabpanel打开重复

 <script type="text/javascript">
            function addTab(href){              
                var id = parseInt(href.substr(31,6));
                var task = href.substr(26,11);                          
                parent.Ext.getCmp("myTabPanel").add({
                    id:id,
                    title: task, 
                    closable: true,
                    iconCls: 'Feed',
                    html: '<iframe src="'+href+'" scrolling="auto" frameborder="0" width="100%" height="100%"></iframe>' 
                    });                                         
                parent.Ext.getCmp("myTabPanel").setActiveTab(id);
            }           
    </script>

以上是在其他页面获取tabpanel