basically I have a variable that main that changes it's background image based on some triggers.
The way it's changes the background image is by adding another class for example .main .bck-1 .main .bck-2 and so on.
My question is how can I preload the background images of bck-1 bck-2 before changing it because my images it glitches on changing because the browser has to download the background-images
