CFCHART "Thermometer" style

I'm looking to create what I would consider a pretty simple progress bar and intend to use the cfchart function. However, I'm hitting a bit of a wall when it comes to overlapping bar values. I'm looking for a single bar column but with multiple fields, for example to show used vs unused resources easily, or a number of other possibilities it could be applied to.

Did a quick google image search - I could probably find better but the "progress bars" here are kinda what I'm after: http://www.bigfuntown.com/App_Themes/Default/images/news/20090619_MedalPoints3.jpg

I hope i have been clear enough to get a response, but please don't hesitate to ask if I have not included enough information.

I know there are other ways to do it such as with a html div function, but for the sake of education, I'd like to know if it's possible using cfchart.

Thanks