The toolbar icons have to be targa images (*.tga). If you want a tga to be transparent you have to have an Alpha Channel that defines the visible and the transparent areas. The one you''re editing has the original alpha channel in it, so you have to make a new one. In Photoshop you can view the alpha channel in the Channels tab next to the Layers tab. To make a new alpha channel, discard the old one, make a s-electio-n of your icons, go into channels and make a new channel. It''s completely black now, but you just have to fill it with white and it''s set. The white areas define the visible parts and the black the transparent parts. The great thing about the tga format is that it allows for smoother edges than a bmp with "hard" edges using magic pink. It''s also great to use for menu buttons, start button and taskbar buttons to name a few.
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