Hello,
For transparent images, open
Image.as file and add a new line just before line number 32 (you must use the original file so that the line numbers match):
Code:
Border._visible = Bground._visible = false;
With that line adde go to line number 133 and change it to:
Code:
var bd:BitmapData = new BitmapData(ni._width, ni._height, true, 0x000000);
Republish the swf and test it with your transparent images.