Scratch

I have 3 sprites that move up and down every few seconds and another sprite that acts as a foreground. When the game is running the player is able to drag these sprites around the screen and I was wondering how to disable this draggable feature, so the user isn't able to move things around? I tried setting the x and y points to the original location in a forever loop, but the user is still able to drag it out to another location; (it just snaps right back to the coordinates specified in the forever loop.)