Resend AJAX request with link?

Is there anyway to reload just the AJAX request, so that it updates the content pulled from the external site in the code below?

$(document).ready(function () {

        var mySearch = $('input#id_search').quicksearch('#content table', { clearSearch: '#clearsearch', });

        var container = $('#content');

        function doAjax(url) {

            if (url.match('^http')) {

                $.getJSON("http://query.yahooapis.com/v1/public/yql?"+

                    "q=select%20*%20from%20html%20where%20url%3D%22"+

                    encodeURIComponent(url)+

                    "%22&format=xml'&callback=?", 

                function (data) {

                if (data.results[0]) {

                    var fullResponse = $(filterData(data.results[0])),

                       justTable = fullResponse.find("table");

                    container.append(justTable);

                    mySearch.cache();

                    $('.loading').fadeOut();

                } else {

                    var errormsg = '<p>Error: could not load the page.</p>';

                    container.html(errormsg);

                }

                });

            } else {

                $('#content').load(url);

            }

        }

        function filterData(data) {

            data = data.replace(/<?\/body[^>]*>/g, '');

            data = data.replace(/[\r|\n]+/g, '');

            data = data.replace(/<--[\S\s]*?-->/g, '');

            data = data.replace(/<noscript[^>]*>[\S\s]*?<\/noscript>/g, '');

            data = data.replace(/<script[^>]*>[\S\s]*?<\/script>/g, '');

            data = data.replace(/<script.*\/>/, '');

            data = data.replace(/<img[^>]*>/g, '');

            return data;

        }

        doAjax('link');

    });

Right now I have a button which reloads the entire page, but I just want to reload the AJAX request. Is this even possible?

Edit: I need to specify more. While it can easily call the AJAX again, can it also replace the info that is already there?