With that script call, you can change the opacity of the picture, without using the game show/move pictures.
But to do the slow fade in/out you have to do a bit more eventing. Maybe use a variable to keep track of the time you want to the fade happen.
Like variable duration = 60;
$gameScreen.picture(id)._opacity -= (255/duration);
if(duration <=0) break loop
Something like that, I'm not entirely sure about the math here xD
But maybe you can find your way out
Oh no. That moment when you try to fix something you modified in your game, like, a year ago but didn't want to fix then, and you now have no idea what you even did. Me right now, trying to figure out why my gold window is over stretched?