Vibrate in web app - no oblective C experience

I'm developing some simple web apps. Using HTML5, CSS, and JavaScript I can make the app do the basics with the alerts, but I would like to make the phone vibrate and sound off when the alert happens.

I'm not keen on using objective C at all honestly. I'm not an objective C porgrammer by any means, and I just want some simple functionality like stated above. Is there a way to do this without having to use the webkit stuff and objective C...or can I use the webkit without using the objective C to load and initialize my webapp?

Thanks,