Simpler approach:
have 2 buttons one over another one with the play and the other with the pause symbol, one tagged "PLAY", the other "PAUSE" each with it's ir code.

You can do it like this:

var play = widget("PLAY"),
pause = widget("PAUSE");

pause.visible = false;
play.visible = true;

play.onRelease = function () {
play.visible = false;
pause.visible = true;
this.scheduleActions();
}

pause.onRelease = function () {
pause.visible = false;
play.visible = true;
this.scheduleActions();
}

You'll get two alternating buttons each with it's IR codes. Hope it helps.