function updatePwywButton(val) {
    var dollars = parseFloat(val) || 0;
    document.getElementById('amount_cents').value = Math.round(dollars * 100);
    document.getElementById('checkout-btn').textContent = 'Continue to Payment - $' + dollars.toFixed(2);
}
// Initialize on load
(function() {
    var input = document.getElementById('pwyw_amount');
    if (input) updatePwywButton(input.value);
})();