CSS adjustments to existing page

I am using flot with jQuery and have a line graph showing 4 lines. Each line has a tooltip that shows the value of the point. I would like to keep this but also display directly onto the graph (not the tooltip) the percentage change between each point and the previous one. So the first point won't show any percentage change, above the second point I'll see, for example, 5% in green (for 5% up), after the third point it may be 2% down so I want to see 2% in red, and so on. Please include "flot master" in your reply.