function isp_add_to_cart(event, product_id) {
    $jquery.ajax({
        url: "/cart/?add-to-cart=" + product_id + "&quantity=1",
        type: "POST",
        beforeSend: function(result) {
            $("#btn_" + product_id).css("background-image", "url(https://storagehub.vmware.com/static/images/vmware/loading.gif)");
            $("#btn_" + product_id).css("background-size", "25px");
            if ($jquery(window).width() > 480) {
                $jquery('.header-wrapper .cart-button b').html("<img src='https://storagehub.vmware.com/static/images/vmware/loading.gif' style='width: 15px; height: 15px;'>");
            } else {
                $jquery('#mobile-header .cart-button b').html("<img src='https://storagehub.vmware.com/static/images/vmware/loading.gif' style='width: 15px; height: 15px;'>");
            }
        },
        success: function(result) {
            $("#btn_" + product_id).css("background-image", "url(https://www.vivamart.no/wp-content/themes/onesocial-child/images/cart-hover.png)");
            $("#btn_" + product_id).css("background-size", "50px");
            if ($jquery(window).width() > 480) {
                $jquery('.header-wrapper .cart-button b').load(document.URL +  '.header-wrapper .header-total', function() {
                    var seen = {};
                    $jquery('.header-wrapper .header-total').each(function() {
                        var txt = $jquery(this).text();
                        if (seen[txt]) { $jquery(this).remove(); }
                        else { seen[txt] = true; }
                    });
                });
            } else {
                $jquery('#mobile-header .cart-button b').load(document.URL +  '#mobile-header .header-total', function() {
                    var seen = {};
                    $jquery('#mobile-header .header-total').each(function() {
                        var txt = $jquery(this).text();
                        if (seen[txt]) { $jquery(this).remove(); }
                        else { seen[txt] = true; }
                    });
                });
            }
        },
        error: function(result) {
            console.log("error");
        }
    });

    event.preventDefault();
    event.stopPropagation();
    event.stopImmediatePropagation();
}