Meditation Timer

I just want a minimal meditation timer preferably in vanilla JavaScript, but jQuery mobile could be OK. The trick is... it is very hard to find code which works on mobile devices too as far as audio goes. Many timers out there cannot automatically play sound when the timer reaches 0:00. This is due to how systems like iOS work. But it is possible. I have seen online timers which have an audio alert and they work on devices like iPhone. So my requirements are: Create a very minimal, no styling necessary, meditation timer which has a bell/gong sound at the beginning, and one at the end. The user must be able to choose the time (up to 60 minutes is fine). The screen should stay awake which can be done with [login to view URL] I’ve seen out there. In short, someone with a lot of JavaScript experience should be able to do this quite easily and so I don’t think this should cost much. Obviously I require the ability to test the timer before I pay. To reiterate it should be done as minimally as possible. HTML and JavaScript only.