FadeSequence w/ next & prev buttons?

i’ve been working with this script from senocular that fades an image sequence. i would greatly appreciate anyone’s input on how to modify it with next and previous buttons that advance the sequence when it is paused.
pleae see attached file.

 
FadeSequence = function (args) {
 with (args) {
  timer++;
  if (timer>pauseTime) {
   if (timer<pauseTime+fadeTime) {
	var curr_fade = timer-pauseTime;
	mc1._alpha = 100*curr_fade/fadeTime;
	mc2._alpha = 100*(fadeTime-curr_fade)/fadeTime;
   } else {
	FadeSequenceReset(args);
   }
  }
 }
};
FadeSequenceReset = function (args) {
 with (args) {
  timer = 0;
  mc1._alpha = 0;
  mc2._alpha = 100;
  mc2.gotoAndStop(mc1._currentframe);
  mc1.gotoAndStop(1+(mc1._currentframe%mc1._totalframes));
 }
};
FadeSequenceInit = function (sequence, pauseTime, fadeTime) {
 var args = new Object();
 args.timer = 0;
 args.pauseTime = pauseTime;
 args.fadeTime = fadeTime;
 args.mc1 = sequence;
 args.mc2 = args.mc1.duplicateMovieClip(args.mc1._name+"2", 1+args.mc1.getDepth());
 args.mc1.stop();
 args.mc2.gotoAndStop(2);
 FadeSequenceReset(args);
 return args;
};
var fadeArgs = FadeSequenceInit(sequence_mc, 48, 24);
this.onEnterFrame = function() {
 if (auto_mc._currentframe == 1) {
  FadeSequence(fadeArgs);
 }
};