Copyright registration cane be done online now for $35. Simply save a copy of your work to disk, fill out the required forms at
http://www.copyright.gov/eco/ and pay the $35.
In a few weeks to a few months you will get a certificate in the mail backing up your claim of copyright ownership.
I guess a website would be visual arts?
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Use Form VA (visual arts) for copyright registration of published or
unpublished works of the visual arts. This category consists of “pictorial, graphic, or sculptural works,” including two-dimensional and three-dimensional works of fine, graphic, and applied art, photographs, prints and art reproductions, maps, globes, charts, technical drawings, diagrams, and models.
What Does Copyright Protect? Copyright in a work of the visual arts protects those pictorial, graphic, or sculptural elements that, either alone or in combination, represent an “original work of authorship.” The statute declares: “In no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work.”