Has anyone found a way to insert a live hyperlink into a "Send Message" popup?

Closest I have come is setting the hyperlink on the agent system tray icon right click list, and when i send a message I refer to that. Would be much better to put a hyperlink in the send message popup that directly links the user to a page dealing with message. I'd basically like to link any message i have to additional resource doc's on my sharepoint site.

I tried HTML:
Additional Information

But failed miserably. Any ideas?

Legacy Forum Name: Hyperlink in "Send message" function,
Legacy Posted By Username: boostmr2