JQuery Alert Dialog Boxes With Simple Demo
Browsers alert boxes are simple and they look different from browser to browser and while sometimes this is a good thing as the user is used to their browser’s alert dialog boxes, there are times that we need a common style for our alert, prompt or confirm dialog boxes.
jQuery Alert Dialogs is a jQuery plugin that will take care of this. With many styling options this is probably all you need.
Read more at its website.