// Create browser compatible event handler. var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent"; var eventer = window[eventMethod]; var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message"; // Listen for a message from the iframe. eventer(messageEvent, function(e) { if (isNaN(e.data)) return; // replace #sizetracker with what ever what ever iframe id you need document.getElementById('advanced_iframe').style.height = e.data + 'px'; }, false);

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