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var myFrame  = Y.one('#myIframeElement');

// Call function defined in the iframe window
//  causes circular reference with the iframe
window.frames['myIframeElement'].window.doSomething(foo);

//next line currently needed for beforeunload
Y.Node.DOM_EVENTS.beforeunload = true;

Y.on("beforeunload",function(e) {
  myFrame.set('src','');
  myFrame.destroy();
}