Reload the contents of iframe on Windows Metro Style App

gistfile1.js

== in the page in iframe

<script type="text/javascript">
window.attachEvent("onmessage", receiveMessage);

function receiveMessage(e) {
  if (e.data == "refresh") {
    history.go(0);
  }
}
</script>

== default.html ==

<iframe id="iframe" src="http://example.com" width="800px" height="400px"></iframe>
<button id="reloadButton">Reload</button>

== default.js ==

var reloadButton = document.getElementById("reloadButton");
reloadButton.addEventListener("click", reload, false);

function reload() {
    var iframe = document.getElementById("iframe");
    iframe.contentWindow.postMessage("refresh", *);
}