Updater

// Use Updater to update the contents of an element
var el = Ext.get('myEl');
var elUpdater = el.getUpdater();
elUpdater.update({
   url: 'Ajax/sampleHtmlFrag.php',
   params: {
     name: 'Joe Smith'
   }
});

// OR access the updater directly through 
// the load method of Ext.Element
el.load({
   url: 'Ajax/sampleHtmlFrag.php',
   params: {
     name: 'Joe Smith'
   }
});