Hi Glenn
I wouldn't see notifiers/observers as an appropriate way to insert HTML or HTML attributes. They're better suited to as ways to hook into processing logic.
There's a much better way nowadays to add extra HTML such as you describe above to a template file, without the need to override it. I'm thinking specifically of javscript libraries such as jQuery, which it has been announced will be integrated into 2.0, are very effective for doing this.



