(This example uses a "flash" animation and therefore needs the "flash player" to work. Since "flash player" is discontinued and no longer present on many systems, this script may not work. I have therefore prepared a new script which does not use flash, but is based only on javascript. You can find it in this new post: www.autoitscript.com/forum/topic/206853-aquarium) If you set within a window, a given color as transparent, every area of that window painted with that color, act as an hole