Using overlayButtons on FusionCharts with javascript links
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I would like to use a javascript function link such as 'link:j-myJS-data' for drill down type charts.  I have everything working great to drill down but cannot figure out how to incorporate the overlayButton through the configureLink when drilling down.  At present, I can drill down but cannot go back.  Can anyone provide a basic example of how I may go about this?  Is it even possible?

I thought I could add my own "Back" button to hande this as one option.  I do not want to use a jsonURL as there is a lot of data and many paramertes need to be passed resutling in a long links and a lot of extra data in the JSON.

Thanks in advance.