jQuery Impromptu – alert and confirm replacement with form support
jQuery Impromptu is an extention to help provide a more pleasant way to spontaneously prompt a user for input. More or less this is a great replacement for an alert, prompt, and confirm. Not only does it replace these but it also allows for creating forms within these controls. This is not intended to be a modal replacement, just a quick tool to prompt user input in a fashionable way.
This is a good plugin to replace alert() and confirm() methods using callback functions. Fully stylabe using CSS. Lots of examples are shown in the site. Read more
jGrowl – To show unobtrusive messages
jGrowl is a nice way to show unobtrusive messages or informations to user.
Advantages
- The default style is good enough
- The message can be shown for a pre defined time (For eg: 10 seconds and then it will close automatically)
- Support for sticky messages – which do not close automatically
- Customizable
Sexy Alert Box for Mootools
It is an excellent script to replace the javascript alert() function. It has good animation effects and lot of customization options. Read more
Three jQuery modal plugins to repace alert and confirm
alert() and confirm() are two javascript functions that you should not use in your web 2.0 sites 
. The main problem with these are the way those blocks the user from interacting with browser. They are modal in behaviour, that means the user should take an action before he can do anything with browser. He can’t even switch to another tab. Here, we suggest three jQuery plugins to ditch the notorious alert() function.
They are jQuery Modal Dialog, jqModal, jQuery SimpleModal Read more
