The priority of a sprite controls
the order in which sprites appear on the screen.
spriteID is the number of the sprite.
priority is the new priority of the sprite.
This can be abny value including negative numbers. The default
priority of a sprite is 0.
Sprites can be placed over each
other and TNT Basic determines which to put on top using their
priorities. The highest priority sprite will be drawn on top.
e.g. The mouse pointer would
have a high priority because it appears over the top of everything.
Note: Buttons have a priority of -1.