//SETTING UP OUR POPUP
//0 means disabled; 1 means enabled;
var popupStatus = 0;

//loading popup with jQuery magic!
function loadPopup() {
    //loads popup only if it is disabled
    if (popupStatus == 0) {
        $("#backgroundPopup").css({
            "opacity": "0.7"
        });
        $("#backgroundPopup").fadeIn("slow");
        $("#popupBanner").fadeIn("slow");
        popupStatus = 1;
    }
}

//disabling popup with jQuery magic!
function disablePopup() {
    //disables popup only if it is enabled
    if (popupStatus == 1) {
        $.cookie("BannerBolZobrazeny", "true", { expires: 600 });
        $("#backgroundPopup").fadeOut("slow");
        $("#popupBanner").fadeOut("slow");
        popupStatus = 0;
    }
}

//centering popup
function centerPopup() {
    //request data for centering
    //var windowWidth = document.documentElement.clientWidth;
    //var windowHeight = document.documentElement.clientHeight;
    var windowWidth = $(window).width();
    var windowHeight = $(window).height();
    
    var popupHeight = $("#popupBanner").height();
    var popupWidth = $("#popupBanner").width();
    //centering

    var puTop = 10;
    var puLeft = 10;

    if (windowHeight / 2 - popupHeight / 2 > 10)
        puTop = windowHeight / 2 - popupHeight / 2;

    if (windowWidth / 2 - popupWidth / 2 > 10)
        puLeft = windowWidth / 2 - popupWidth / 2;
    
    $("#popupBanner").css({
        "position": "absolute",
        "top": puTop,
        "left": puLeft
    });
    //only need force for IE6

    $("#backgroundPopup").css({
        "height": windowHeight
    });

}