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The most I can say is download 16.1 and start tracing through that code. Open your project and a second instance of RMXP to open the 16.1 base in, you can start at the options screen and Ctrl+Shift+F your way to the relevant code. For example, Sprite_Resizer has a pbConfigureFullScreen function you can probably copy over.
The other option is to upgrade to 16.1 somehow. Dunno what else to tell you.
Or you can just do a quick search (or look through the scripts sections on the forums), and find the FS script I made, which is pretty much what's in v16 anyway. The script isn't perfrect though.
Tustin2121 i'll try to copy just that part of the script as you said, i've already tried to copy some parts, but with no results (exeption for errors of course...)
Luka S.j. i've already tried your script, and the result was the not centred game
screen.
Thanks for the answers and sorry for waste your time, as you can see i'm a noob with the scripts and help like this will help me a lot with my project. :v