Coding a .jpg presentation during live stream using Wowza Transcoder or other way.

Hello, we have an AS2 based, working live app. in development. The next task would be the following: Similar to what you see here, to code a "presentation" possibility for the Client/Moderator like in this sample when appears the slide "in foreground of the speaker" , by a push of button on his own personal webadmin surface. [login to view URL] We do have a ready made webadmin surface from which any Client is able to stream live any time he likes. After entered into his own Moderator' surface in the webadmin he should have a possibility: - to upload to his own personal folder on Wowza all his presentation files /.jpg ,.pdf is enough/ before the show - during the show to have a simple "play/stop" button inserted also on his Moderator surface, from where he could "play"/"stop" the slides with the mouse in his "foreground" -when the Moderator finish speaking from the foreground posted .jpg /pdf/ pushing the "stop", the slide should disappear from foreground. When /any time/ the Moderator likes to show a new slide, he should push again on "play" and so one. Fortunately, from Wowza 3.6 there is a very simple possibility to use they Transcoder Add-on to resolve this task. I have already asked Wowza, and they agreed. pls. look at here [login to view URL] Who is up-to-date with Wowza and his Transcoder should know this.