(function($) {
        var self = null;

        $.fn.liveUpdate = function(list) {
                return this.each(function() {
                        new $.liveUpdate(this, list);
                });
        };

        $.liveUpdate = function (e, list) {
                this.field = $(e);
                this.list  = $('.' + list);
                if (this.list.length > 0) {
                        this.init();
                }
        };

        $.liveUpdate.prototype = {
                init: function() {
                        var self = this;
                        this.setupCache();
                        this.field.parents('form').submit(function() { return false; });
                        this.field.keyup(function() { self.filter(); });
                        self.filter();
                },

                filter: function() {
                        if ($.trim(this.field.val()) == '') { this.list.children('li').show(); return; }
                        this.displayResults(this.getScores(this.field.val().toLowerCase()));
                },

                setupCache: function() {
                        var self = this;
                        this.cache = [];
                        this.rows = [];
                        this.list.children('li').each(function() {
                                self.cache.push(this.innerHTML.toLowerCase());
                                self.rows.push($(this));
                        });
                        this.cache_length = this.cache.length;
                },

                displayResults: function(scores) {
                        var self = this;
                        this.list.children('li').hide();
                        $.each(scores, function(i, score) { self.rows[score[1]].show(); });
                },

                getScores: function(term) {
                        var scores = [];
                        for (var i=0; i < this.cache_length; i++) {
                                var score = this.cache[i].score(term);
                                if (score > 0) { scores.push([score, i]); }
                        }
                        return scores.sort(function(a, b) { return b[0] - a[0]; });
                }
        }
})(jQuery);