Quick and dirty bitcoin donation button, as seen on https://gobblin.se

donate-bitcoin.html

<style>
.donate-button {
    text-align: center;
}
.donate-button .bitcoin-address {
    font-size: 1.5em;
}
</style>

<div class="donate-button">
    <a class="donate-button-link" href="#donate">
        <img src="http://ef3ae845b6eed6ec4024-8a0a46e5f1a5cc9854958bc3503f0f88.r40.cf1.rackcdn.com/donate_64.png" alt="Donate Ƀitcoin" />
    </a>
    <div class="bitcoin-address">Ƀitcoin address: <code>1Q3p3N5Eu7roSFFmjMevD7eymtpfC7urSk</code> <3</div>
</div>

<script>
$(document).ready(function () {
    $('.donate-button-link').on('click', function (e) {
        e.preventDefault();
        $(this).slideUp(100);
        $('.bitcoin-address').slideDown(100);
    });
});
// Hide address immediately if JS is enabled
document.querySelector('.bitcoin-address').style.display = 'none';
</script>