Help with creating a new function? (pop-up windows)

[Grehy]

I need a function that could act on a pop-up window being closed or "accepted", what ever the proper term would be. An example would be that a player is assigned storage value "1", and a popup window appears on his screen telling him this. When he hits "ok" or the window is closed (what ever the proper term is), it changes to "2", or anything else happens.

Is this possible? I couldn't begin to imagine on how to construct such a function

 

[Cykotitan]

Closing the message info dialog box is purely clientsided, it also doesn't send any packet to the server. I'm afraid it's not that simple without being able to edit the client somehow.

 

[Darkhaos]

Use tibia API