Custom Player

Hello,

I am not great with JavaScript, and this is my attempt at creating a custom player.

We needed the ability to jump back x seconds (I plan to make this a variable to adjust the time and update the button text quickly)  across multiple slides, and we wanted all the control in one place. The inbuilt player has buttons a bit scattered, and we can't add custom buttons.
The space in the player's middle is for the closed captions text, so it doesn't cover content on the slide.

I have managed to get all the code to keep its settings as we move from one slide to the next, except the mute button. If the user mutes, I want this to stay muted when we go to the next slide.

Any help to solve this and tidy up my scripts would be greatly appreciated.

Fiona