So, I've taken the indicator and made some options, upgrades and published it for free!. The basic foundation of the code is still the %J equation. I've included an option to use either the (default) and the (more traditional slow ). You can also adjust the lookback period, %D smoothing, and I've included the option to smooth the %J. This last option slows the indicator down a little, but really cuts out the of the %J crossings.
Get the source here: http://pastebin.com/CVrVn9F6
Installation video by @ChrisMoody here : http://vimeopro.com/user14689865/tradingviewcom-how-to-videos