Are there any JavaScript library for cross browser desktop notification?

I don't know of a cross-browser lib; but desktop-notifications are coming to Mozilla Firefox post 4.0 as well. They're implemented in trunk already: https://bugzilla.mozilla.org/show_bug.cgi?id=573588

Though apparently this new feature won't get included in FF 4.0: https://bugzilla.mozilla.org/show_bug.cgi?id=594543

But in the long term, an api related to but different from the webkit will be available.

Not sure about opera, however.

These are some that I found:

• https://github.com/alexgibson/notify.js
• https://github.com/ttsvetko/HTML5-Desktop-Notifications