/**
 * Pobierz i ustaw kolejną stronę za pomocą AJAXa
 */
function changePage(th){
    $.blockUI();
    $.ajax({
        url: th.href,
        cache: false,
        complete: $.unblockUI(),
        success: function(html){
            $("#category_items").fadeOut("slow", function() {
                $("#category_items").replaceWith($(html).contents("#category_items"));
            });
        }
    });
}

function slide(field){
    $(field).next().slideToggle("slow");
}

function getCookieVal(offset){
    var endstr = document.cookie.indexOf(";", offset);
    if (endstr == -1) 
        endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}


function GetCookie(name){
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg) 
            return getCookieVal(j);
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) 
            break;
    }
    return null;
}

function SetCookie(name, value, expires, path, domain, secure){
    document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

function DeleteCookie(name, path, domain){
    if (GetCookie(name)) {
        document.cookie = name + "=" +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}

function linksExternal(){
    if (document.getElementsByTagName) {
        var anchors = document.getElementsByTagName("a");
        for (var i = 0; i < anchors.length; i++) {
            var anchor = anchors[i];
            if (anchor.getAttribute("rel") == "external") {
                anchor.target = "_blank";
            }
        }
    }
}

function stat(){
    var res;
    win = window.screen;
    if (window.screen) 
        res = win.width + 'x' + win.height;
    var czas = new Date();
    czas.setTime(czas.getTime() + (365 * 24 * 60 * 60 * 1000));
    SetCookie("stat", res, czas, '/');
}