gifX()

         Returns the width of a GIF

    Syntax:

         gifX ( cFile ) -> nWidth

         cFile : Name of the GIF file

    Description:

         This function returns the width, in pixels, of the GIF image.

    Return:

         A numeric value indicating the number of pixels in width or Nil
         if the file does not have GIF format.

    Example:

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