Tired of the default alert dialog that your web browser displays? Custom Alert is a demonstration of how to over-ride the default window.alert method of a browser and will allow you to create alert messages that fit in with the overall style of your web application. The author has posted a disclaimer to the effect that this is only a demonstration; this method does not allow for true modality so it may not in fact be an alternative worthy of a production environment, relative to how the window.alert  method behaves. Still though, this custom alert demonstration is worth taking a look at.
[link via The JavaScript Weblog]