need a javascript (or something) thermometer or gauge display that is easily adjusted

I have a client who is doing fund raising and they would like to put a thermometer or gas-style gauge on their site, which they can easily adjust, to show how much money they've raised.

Does anyone know of anything already existing that I could put in their site, that will allow them (completely not technical people) to easily adjust the amount shown?

Thanks for any helpStart Free Trial