Countdowns can be a great way to build up anticipation when launching a new website or web application, it gives users a clear indication of how long they need to wait before they can get access to your site.
jQuery Countdown is a handy and pretty jquery countdown plugin for you. You can easily customize the format, images, width and height. And it’s only 1.7 KB. Best of all, it’s released under Apache License 2.0 which is free for download.