Javascript Graphing Utility - Multiple Y axis for Line Graph

Is there a 开发者_运维问答way to plot more than 2 y-axes with any of the javascript graphing libraries out there? Flot is the best one I've seen, but it only covers 2 y axes.

Protovis is a substantially more powerful visualization tool, and it should be able to handle your use-case. However, be prepared to write a lot more code than you would have with Flot.