One of The Dark Knight‘s viral sites, www.ibelieveinharveydent.com, has been fully launched with updates and a personal audio message from Dent.

A few days ago, the site contained just a message and email sign-up area (see “˜Dark Knight’ Harvey Dent Campaign for Gotham), but is now a full site with various pages.

The purpose of the site is too encourage the people of Gotham to support Harvey Dent in his fight to take back the city from the crime that has overrun it. A message on the home page says, “Show enough support for Dent’s crusade for change and he’ll run for District Attorney. Gotham’s fate rests on us. It’s in our hands to take Gotham back.” You can hear Dent’s personal message to his fellow townspeople here.

There’s banners and other promotional images available for download; a map of the cities where the “Dentmobile” will be visiting; and a section that lists ways to show your support for Dent (for example, get your friends together and spell out Harvey Dent in human letters), with an area where you can submit your photos showing said support.