$( "document" ).ready(function() {
    $.ajax({
        url: "getdata.php",
        data: "type=getnum",
        cache: false,
        success: function(html) {
            if (html == " ") {
                alert("Error");
            } else {
                window.num_articles = html;
            }
            if(getParameterByName('id')) {
                window.actual_id = getParameterByName('id');
            } else {
                window.actual_id = 0;
            }
            $.ajax({
                url: "getdata.php",
                data: "type=init&data="+window.actual_id,
                cache: false,
                success: function(html) {
                    if (html == " ") {
                        alert("Error");
                    } else {
                        $( "#klik" ).html(html);
                        if (window.actual_id == undefined) {
                            window.actual_id = 0;
                        } else {
                            window.actual_id -= 5;
                        }
                        window.last_used = "prev";
                        if(window.actual_id < 0) {
                            window.actual_id = 0;
                        }
                    }
                },
                error: function () {
                }
            });
        },
        error: function () {
        }
    });
});