There is an excellent code example on how to make nice jQuery Twitter style alerts here:

http://blog.codecrate.com/2009/10/twitter-style-alerts-in-rails.html

$(function () {
  var alert = $('.alert');
  if (alert.length > 0) {
    alert.show().animate({height: alert.outerHeight()}, 200);

    window.setTimeout(function() {
      alert.slideUp();
    }, 3000);
  }
});

However, one thing that the code doesn't include is functions to stick the alert div to the top of the window, no matter how far down the page the user has scrolled.

I have found a few examples but nothing seems to play nice with this existing code.

Any ideas?