zhomeslice:
to make the page look pretty (The aggressive part)
I'm sure I'm a bit strange but for me aggressive is almost the opposite of pretty.
I wasn't commenting on your use of Ajax etc to update part of the browser page - that's a good idea. (If you have some spare time maybe you could teach it to the Arduino Forum developers :))
But whatever happens on the browser the Arduino needs to get the PWM value from somewhere and it is much better use of Arduino resources to store it in a variable rather than try and recreate it from the Timer registers.
...R