Am I right in thinking that you are referring to the topics displayed in the TOC? If so, I am not aware of a way to add an image after a topic title. However there are some other options, but some of these will depend on the ouptut type being produced. Can you let us know?
Out of interest, if you right click on a topic in the TOC and select Properties, there is a "Mark as New" option in the Advanced tab. This displays a red star overlay in the TOC icon for the topic (or book for that matter) to signify to users that it is new. You'd have to educate your users to draw their attention to this. Maybe this would meet your needs? If not, let us know your output type and we can go form there.
This works for CHM (Microsoft HTML Help)
If your primary output is CHM (Microsoft HTML Help ) then you will get these options in UI.
Sorry but there is no way to achieve this that I know of in WebHelp Pro. Perhaps you could add a "What's New" topic to the top of the TOC with links to any new / changes topics.
Thanks for your prompt response. Much appreciated.