You could try to solve it with a JS action. You could use the HTML/JS module fomr the app store, to build the JS and use it for your text attribute.
Thank you for your answer, it works. I implemented this solution: http://heyman.info/2010/sep/30/jquery-title-alert/
For other people who might want to do this, I did it as follows:
1 – Download ‘jquery.titlealert.js’ and add it to your theme folder.
2 – Also add the jQuery library if it's not already in there:
<script type="text/javascript" src="jquery.titlealert.js"></script>
3 – Add the following snippet to your index.html in your theme folder
<script src="http://code.jquery.com/jquery-1.4.2.js"></script>
4 – Add a HTML snippet to the page you want to initiate the blinking with this JavaScript code:
$.titleAlert("Your message here.", {
requireBlur:false,
stopOnFocus:false,
duration:4000,
interval:700
});
That’s it. Thanks Gerrit for the suggestion.