Jamey is right - with photographs the photographer retains the original copyright always. Wedding photography is a classic example. Despite the huge wads of dough you hand over for your album, you have no right to have any of those shots copied without going through the original photographer, unless the deal you did at the time involved also purchasing the negs and the copyright. Some photographers can be real sticklers about this as they depend on reprints etc. to supplement their income and they
will sue.
There's no real need to stick a copyright notice on your web pics - you retain copyright anyway, but it's no bad thing, the lamos who are likely to nick your images at least can't claim ignorance.
Hmmm... something I need to think about actually.
