Creating GIF files:

 If we want to merge two pictures, we are to open these two pictures,
 copy one picture to clipboard and paste it to another picture.
 Then we are to choose Object Picker Tool and choose "Merge: Subtract".

 Then we can choose menu: Image->Convert To->Paletted (8bit)->
 Palette type:Optimized, Colors:16

 Then we are to saving picture as GIF.

Creating Buttons in html:
 Text: Arial Bold 12 (no Anti-aliasing)
 Pushed: Red (255,0,0)
 Released: Blue (0,0,255)

