var postman = new NoJQueryPostMessageMixin('postMessage', 'receiveMessage');

var eID = "##REPLACE##EVENTID##_iframe";
var msg = {
	resize: eID,
    height: document.body.scrollHeight,
    width: document.body.scrollWidth
};

postman.postMessage(JSON.stringify(msg), "##REPLACE##TARGETURL##", parent);