The transparency setting of
a sprite controls how visible it appears. Each sprite can be
invisible, opaque or anywhere in between.
spriteID is the number of the sprite.
transparency is the new level of transparency. This
can range between 0 (opaque) and 100 (invisible).
There are certain levels of
transparency which can be drawn faster than all the others. If
speed is critical then we recommend using these transparency
levels:
100
93
87
75
50
25
12
6
0