gifIsPalette()

         Determines if the GIF has palette or not

    Syntax:

         gifIsPalette( cFile ) -> lPalette

         cFile : Name of the GIF file

    Description:

         This function determines if it must use the system palette in
         order to show the image or the GIF has its own palette.

    Return:

         A logic indicating if the GIF has palette or Nil if the file does
         not have GIF format.

    Example:

         ? gifIsPalette ( "c:\xx\giveme.gif" )