If you have Pro Account and access to Ning's File Manager, you can customize the link for the HTML you pull into iframe (http://www.ideen-lounge.com/slider). After you upload the HTML via File Manager, click on "customize link", and name it slider as in example code above. Each time you make a change to HTML, delete old. Reupload new, and name the link to slider, again. This way you never have to change the code in the Text Box.
If I thought I could do it 2 minutes, I'd definitely help. But there's no way. I'd have to familiarize myself with this particular code, try to install, and test. Maybe someone on Creators.ning.com would help. Give it a try.
Tips: You either have to install the js files and link to the CSS style sheet via your Custom Code Box, and add the slider code to your text box.
I'm getting to where I create the sliders on an external server, and call it via an iframe. It takes less time to edit, and less conflicts with Ning.