var newsfeed = new Ext.Panel({
    deferredRender:true,
    border: false,
    frame: true,
    autoScroll: true,
    items:[
    {
        autoScroll:true,
        closable:false,
        //autoLoad: 'newsfeed.php' 
        html: '<iframe src ="newsfeed.php" width="100%" height="100%"></iframe>'
    }]
});