//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");
        $("#popupCart").fadeIn("slow");
        popupStatus = 1;
    }
}



//disabling popup with jQuery magic!
function disablePopup() {
    //disables popup only if it is enabled
    if (popupStatus == 1) {
        $("#backgroundPopup").fadeOut("slow");
        $("#popupCart").fadeOut("slow");
        popupStatus = 0;
    }
}



//centering popup
function centerPopup() {
    //request data for centering
    var windowWidth = document.documentElement.clientWidth;
    var windowHeight = document.documentElement.clientHeight;
    var popupHeight = $("#popupCart").height();
    var popupWidth = $("#popupCart").width();
    //centering
    $("#popupCart").css({
        "position": "absolute",
        "top": windowHeight / 2 - popupHeight / 2,
        "left": windowWidth / 2 - popupWidth / 2
    });
    //only need force for IE6

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

}