We'll create fresh WordPress site with Flash CountDown Plugin installed. You have 20 minutes to test the plugin after that site we'll be deleted.
With the count down plugin you are able to count down for your visitors to a certain Date. When this date is reached, a custom image will be shown (which can be defined by yourself).
This plugin is Widget enabled, so you are able to add it to your sidebar just by drag and drop and your counter is ready!