to be concrete, on a 256 colors bitmap, pink (255,0,255) will be used as the mask (aka transparent color) if first and last pixels of the image are of that color. i.e. a 256 colors 300x300 image with pixels 1,1 and 300,300 of the same pink color (255,0,255) will be totally transparent. over the logonui you'll also need to point which color is transparent on the uitext, by default already mentioned pink. btw, with that method you won't be able to use translucent areas. to achieve this, is necessary a 32bits image with an alpha channel. for this you can use PS, PSP, the gimp or other advanced graphical tool hope this to be enough clear as i've seen the forum filled with similar questions