screenNo=1
var_opacity1=100
var_opacity2=0
var_opacity3=0
function change()

transitions = { }
transitionNo = 1
var_transition = transitions[transitionNo]

    screenNo = screenNo + 1
    if screenNo > 3 then screenNo = 1 end
    var_opacity1 = screenNo == 1 and 100 or 0
    var_opacity2 = screenNo == 2 and 100 or 0
    var_opacity3 = screenNo == 3 and 100 or 0
transitionNo = transitionNo + 1
    if transitionNo > table.getn(transitions) then transitionNo = 1 end
    var_transition = transitions[transitionNo]
    wm_transition(var_transition)

end