OK I did more investigation, and it appears that postMessage works in all modern browsers, even IE (with the caveat that IE has a slightly different way of doing it). Here's how I got it to work (tested on WinXP in IE8, FF3.5, Chrome 3.0, Safari 4 beta, Opera 9.64):
server1/test.html
<html>
<head>
<script type="text/javascript">
if(navigator.appName == "Microsoft Internet Explorer")
window.attachEvent("onmessage", receiveMessage);
else
window.addEventListener("message", receiveMessage, false);
function receiveMessage(e) {
if(e.origin == "http://server2") //important for security
if(e.data.indexOf('redirect:') == 0)
document.location = e.data.substr(9);
}
</script>
</head>
<body>
<iframe src="http://server2/test2.htm" width="400" height="150"></iframe>
</body>
</html>
server2/test2.htm
<html><body>
<script>
function clickit() {
parent.postMessage('redirect:http://www.google.com', 'http://server1');
}
</script>
<p>This should be in an iFrame!</p>
<p><a href="http://www.google.com" target="_parent">normal link</a></p>
<p><a href="javascript:clickit()">javascript link</a></p>
</body></html>
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