proxy_frame.js

// http://shouldersofgiants.co.uk/Blog/post/2009/08/17/Another-Cross-Domain-iFrame-Communication-Technique.aspx
// Forward message to the "real" iFrame that should be
// hosted somewhere in the parent page
function getFrame(name){
  for(var i=0;i<parent.frames.length;i++) {
    if (parent.frames[i].name == name) return parent.frames[i];
  }
}

function ForwardMessage() {
  var wcirbmif = getFrame("wcirbmif");
  wcirbmif.onMessageFromParent();
}

// Hook up the Forward Message dependent on browser. FF will only raise the
// resize event on the window / body. 
if (window.addEventListener){
  window.addEventListener('resize', ForwardMessage, false); 
} else if (document.body.attachEvent){
  window.attachEvent('onresize', ForwardMessage);
}

// Ensure ForwardMessage is called once after the page is loaded so that
// any message sent during page load is eventually passsed on. Particularly
// needed if you are looking at resizing content.
setTimeout('ForwardMessage', 0);