title: postMessage() alternative for ie6/7 between iFrames and/or pop ups
body: <p>I am attempting to create a login button for web application which either loads an iFrame or a pop up window. Similar to that of Facebook login button. Im currently using the postMessage() method which works a treat. </p>
  
  <p>However I know that it wont work in IE6/IE7 which I need to support. Is their any alternatives I could possibly use? or am I hoping for to much from the "awesome browser" that is IE6?</p>