egAttrAll()

         Gets/Sets the RGB values of all attributes for all palettes

    Syntax:

         egAttrAll ( [cNewRGB] ) -> cOldRGB

         cNewRGB : A 768 byte string specifying the RGB codes of all the
                   colours in the palettes using the format:

                                    Palette 0               Palette 15
                                 Red  Green Blue          Red  Green Blue
                     Color  0 -> byte byte  byte .....    byte byte  byte
                      ...     -> ...  ...   ...  .....    ...   ...   ...
                     Color 15 -> byte byte  byte  .....   byte byte  byte

    Description:

         These funtion lets change all the colours of all the VGA palettes.

    Return:

         A 768 byte palette with all the palettes information.

    Ejemplos:

       cPaleta := Replicate ( Chr( 63 ) + Chr( 0 ) + Chr( 0 ), 16 )
       egAttrAll( Replicate ( cPaleta, 16 ) )
       // sets the 16 palettes to different degrees of red