use link category as css class

Hi there, im trying to render my link list with an added css class of the link category

for example i would like the following link

name: foo
url: http://www.foo.org
categories: ping, pong

to render like this in my link list

<a href="http://www.foo.org" class="ping pong">foo</a>

does anyone have an idea how to do this? I’ve tried a few things to no avail

Thanks

jt