Backwards compatible window.postMessage()

Simple cross-domain messaging

This blog post explains how to implement a backwards compatible version of window.postMessage() to handle all your cross-domain messaging needs. If you’re in a hurry, you can skip directly to the demo or just grab the following files:

• parent.html
• child.html
• postmessage.js

http://www.onlineaspect.com/2010/01/15/backwards-compatible-postmessage/