<script>
var selectCallback = function(variant, selector) {
if (variant && variant.available) {
// valid variant selected
$('#add-to-cart').removeClass('disabled').removeAttr('disabled').val('Add to Cart'); // remove unavailable class from add-to-cart button, and re-enable button
if (variant.compare_at_price == 0){
$('.product-title .price').html(''+Shopify.formatMoney((variant.price*1.2), "{{shop.money_format}}")+' Excluding VAT');
} else {
$('.product-title .price').html('<span>'+Shopify.formatMoney((variant.price*1.2), "{{shop.money_format}}") + '</span> <del>' + Shopify.formatMoney(variant.compare_at_price, "{{shop.money_format}}") + ' Excluding VAT</del>');
}
} else {
// variant doesn't exist
$('#add-to-cart').addClass('disabled').attr('disabled', 'disabled').val('Sold Out'); // set add-to-cart button to unavailable class and disable button
var message = variant ? "Sold Out" : "Unavailable";
$('.product-title .price').text(message); // update price-field message
}
};