create a bookmarklet

I need a bookmarklet. It must interact with a stream of chat messages in a flash-powered chat room. When clicked, the bookmarklet must prompt the user for a list of comma-separated strings. The prompt should say this, either with or without quotes: "Please type in the comma-separated list of chat room user names you would like included in your filtered stream". The user would then enter something like "Bob, Sarah, Phil T, Steve Raniski". Once the list had been entered and OK clicked, only chat messages from the users included in that list should be shown. All other chat room messages should be excluded.