I just want to document an issue I had running growler with jQuery 1.4.5 in case anyone else does the same.
When trying to init an external header, I would get a "toolbar is not a function" error. Removing this line I had blindly copied in to my page in order to get growler working solved the issue:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js" type="text/javascript"></script>
Hopefully this will not break growler.