cycleColor = function() {
    ++curColor;
    if (curColor == colors.length) {
      curColor = 0;
    }
    jello.className = "jello " + colors[curColor];
  },
  checkColorMatch = function() {
    if (curColor == nextMatchColor) {
      ++streak;
      dur -= 10;
      if (dur < minDur) {
        dur = minDur;

      }
      streakCounter.innerHTML = streak;
    } else {
      streak = 0;
      dur = 2000;
      streakCounter.innerHTML = "";
    }

    prevMatchColor = nextMatchColor;
    nextMatchColor = chooseColor();

    boxes[0].className = "box " + colors[prevMatchColor];
    boxes[1].className = "box " + colors[nextMatchColor];

    rerun();
    setTimeout(checkColorMatch, dur);
  };

main.classList.add("run");
jello.classList.add(colors[curColor]);
boxes[0].classList.add(colors[prevMatchColor]);
boxes[1].classList.add(colors[nextMatchColor]);

for (b in boxes) {
  if (b < boxes.length) {
    boxes[b].classList.add(colors[chooseColor()]);
  }
}