Yves Jalbert , Apr 10, 2007; 03:24 p.m.
Whenever you press the camera shutter you essentially create copyright. That means you created content of which you are the author. So unless you decide to specically "give" or "sell" them the copyright, it is yours by default.
In your situation, a non-exclusive license is what you would probably need to sell to the client. Basically you sell them the rights to use the images (an agreement) for a specific usage, and for a specific period of time. Because the license agreement is non-exclusive to them, you can also sell the images elsewhere on your own. However you still retain the copyright, you are the author. If the client wants to buy the right to use the product but also wants to buy the product itself (your copyright) they would usually pay a lot of money since you'll never be able to use these images again or make future profit from them.
There are many ways to approach this. I suggest you start by going through the business forum section of this site (many excellent references), and maybe check out Amazon as well for books on the subject. I'm sure you'll find great references. Good luck.