GFX = { }

function GFX.fadeIn(widget, time, elapsed)
    if not elapsed then elapsed = 0 end
    if not time then time = 750 end
    widget.opacity = math.min((255*elapsed)/time, 255)
    if elapsed < time then
        scheduleEvent(function()
                        GFX.fadeIn(widget, time, elapsed + 30)
                      end, 30)
    end
end

function GFX.fadeOut(widget, time, elapsed)
    if not elapsed then elapsed = 0 end
    if not time then time = 750 end
    widget.opacity = (255*(time - elapsed))/time
    if elapsed < time then
        scheduleEvent(function()
                        GFX.fadeOut(widget, time, elapsed + 30)
                      end, 30)
    else
        widget:destroy()
    end
end