var greeting = new Ext.Panel({
    //renderTo: 'center',
//    fitToFrame: true,
    deferredRender:true,
    monitorResize: true, // relay on browser resize
    //layout: 'fit',   // throws an error
    border: false,
    frame: true,
    autoScroll: true,
    items:[
    {
        //contentEl:'center2',
        
        autoScroll:true,
        closable:false,
        autoLoad: 'greeting.php' 
    }]
});