int numFrames = 7;
//int frame = 0;
PImage[] images = new PImage[numFrames];

void setup(){
  size(150,222);

  for (int i = 0; i < images.length; i++){
    String imageName = "bath" + nf(i, 0) + ".png";
    images[i] = loadImage(imageName);
  }
}

void draw(){
int frame = int(random(0, numFrames));
  
  image(images[frame], 0, 0);
  frameRate(random(1, 18.0));
}