Or, modifying the formwizard.js, what var should I use to assign an id to the 'next' span on the sections? If they had an id I could interface with that.
Giving the "next" span a unique ID value is simple enough. Just replace the original line you cited above with the below instead:
Code:
var $paginatediv=$('<div class="formpaginate" style="overflow:hidden;"><span class="prev" style="float:left">Back</span> <span class="status">Step 1 of </span> <span class="next" style="float:right" id="'+setting.formid+'_next">Next</span></div>')
With it the "next" span now carries an ID value of "formid_next", where "formid" is the ID value of your FORM element, such as "feedbackform_next".
If being able to access the "next" span directly doesn't suffice in accomplishing what you want, take a look at using the onpagechangestart event handler in conjunction.
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