$.fn.findNS

findNS.js

(function($) {
    // an extension to jQuery to allow "find" with XML namespaces
    $.fn.findNS = function(ns, selector) {
        var prefix = ns + ":";
        return this.find(selector).filter(function(idx, el) {
            return el.nodeName.indexOf(prefix) == 0;
        });
    }
})(jQuery);