15. The system as claimed in claim 13 wherein the portion of the content object changed upon execution of the content viewer readable code component includes an image.
13. A system comprising: a computer; a content viewer operably installed on the computer; and a content object accessible to the computer via the content viewer, the content object including a content viewer readable code component, the content viewer readable code component including dynamically selectable characteristics, the content viewer readable code component being useable with a plurality of different content viewers, the content viewer readable code component changing a portion of the content object upon execution of the content viewer readable code component without altering the remainder of the content object.