Great job Yuichi

Hey, this is really great work! You have really shown a good understanding of jquery and dom manipulation. Your code is also quite readable. I love that you keep your variables clean and descriptive. Really, you should be quite proud of yourself!

I added some comments to your code. My biggest issue is with the way that you use the 'children()' function. Although the code works, it is quite hard to reason about. We should strive to make our code easily understandable so that it is easy to change.

We will debug issue with the play/pause button tomorrow during our office hour. Good job so far.