Displaying Irregularly Shaped Images/Transparency

[HangTime]

What I'm trying to do is display some irregular shapes over some other
images, and naturally I don't want the White Space/background to create a
large square ... I just want the shape.  This seemed like a use for the ink
property, as I couldn't find any other suitable option, and "Transparent"
seems to be the type of ink I need to use.  Testing it, it works perfectly
here, however, transparent is only available under Mac OS?  How do I mask
out the white space so that it'll work on any other platform I want to
distribute my app for?  TIA --HangTime [Will Compute for Food]  B-)>