html in bb code?

[kh99]

Simon's almost got it, but it would be:

<a id="rc-{param}" class="rafl" href="http://www.rafflecopter.com/rafl/display/{param}/" rel="nofollow">a Rafflecopter giveaway</a>
<script src="//d12vno17mo87cx.cloudfront.net/embed/rafl/cptr.js"></script>

Then in your post it would be [raffle]e5c3550[/raffle] (I left off the rc- because in the html you posted, the rc- only appears in one place).