Before you take any action, I suggest doing as much research as possible.
1. get the complete URL of the page on which the photo resides. (ex. http:/ /company.domain.com/index.html)
2. Get the name of the image file from the server if possible.
a. In Firefox, right-click on the image; select view image from the drop down menu. The path to the file name is in the address bar.
b. In IE, right click on the image; select Properties from the drop down menu. The path to the file name is printed next to Address:
c. In most any browser you can view source code. If you understand source code, the file and path names are often hard coded.
3. You may also save copies of web pages and file. I suggest doning so. I would then create and MD5SUM of the stored copies. If you do decide on legal action, it is necessary to prove authenticity.
As Thomas stated, if you did not file with the copyright office, then you will not be able to collect punitive damages. See the copyright's
U.S. Copyright Office - Copyright in General (FAQ)