Asking for Bitcoin donations on your site? Use below code. 


Make sure to add your address 

<a href="javascript:void(0);" onclick="javascript:window.prompt ('Please copy-paste the Bitcoin address below to your Bitcoin software. Thank you for your generosity\.', 'BITCOIN ADDRESS');">
<img src="http://i1349.photobucket.com/albums/p753/bitcoincanada/donate_64_zps02e4eca6.png" width="193" height="48" alt="Donate Bitcoin" />
</a>
<div style="font-size:8 px;">Found an article helpful? Donate Bitcoins</div>

Modified from:
http://leo.bogert.de/2012/02/22/simple-bitcoin-donate-button/