have no idea how it works xDQUOTE
To make a transparent bitmap you must make sure that the bitmap has been converted to Indexed 256 colour. 24bit Bitmaps will not make a transparent image. Make sure that pixel (0,0) in the top left most part of the picture has the colour you want to be transparent.
If you have a background colour that you do not want to be transparent put another colour at pixel (0,0), preferably 1 that doesn't appear in the rest of the image. Some image editors allow you to add a colour to the palette if needed.
In some cases setting colour 0 in the colour index also can help[/b]