We recently released jQuery Fiji Paginate as part of our jQuery Fiji project (some widgets based on jQuery UI). The pagination widget is fully compatible with will_paginate (Rails 3 branch). It has nearly the same configuration options and output (even the logic behind it is very similiar … just in Javascript).

So if you want to replace several pages using Javascript only (maybe by directly fetching data from Solr using our small QuerySolr Javascript library), where pagination is needed, then maybe this will help you.