I have a background layer called bg_random.
But this code:
randomize();
var lay_id = layer_get_id("bg_random");
var back_id = layer_background_get_id(lay_id);
global.backgr=choose(bg_regular,bg_dark);
layer_background_index(back_id, global.backgr);
doesn't work.
Nor does this work...