This solution:

You can do that by reading this: http://www.s9y.org/44.html#A29

A blogg there I have done like above and the RSS stopped working:
http://tobias.cattis.com
A blogg there I have removed the solution above, and the RSS is working again:
http://kattblogg.cattis.com

When I use the above solution to add my own smilies, then the RSS Feed stops functioning. Anyone know why???