[jQuery] jquery-based typing test?

[Jack Killpatrick]

Hi All,
I'm about to put together a js-based typing test and am wondering if 
anyone might know of a plugin or code drop that might give me a head 
start? Basic process:

1. user sees an image of a block of text
2. clicks a button to start a timer
3. types into a textarea
4. textarea becomes disabled when timer runs out
5. some calcs are performed (words per minute, accuracy) and available 
via js (for setting into hidden form fields)

Thanks,
Jack