We need to load the javascript to load the channel API asynchronous.
Is there a way to know when the script has been downloaded and
available? I've looked into script.onload and
script.onreadystatechanged but it doesn't seem to be reliable enough.
The best thing would be if there was a callback method from
channel.js.

This is similar to what I want to do:

  var script= document.createElement('script');
  script.src = "/_ah/channel/jsapi";
  document.getElementsByTagName('HEAD')[0].appendChild(script);
  script.onload = proceedWithSomethingElse;

But this only works in decent browsers.

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