No problem
The code tag is simply:
[ code ]CODE[ / code ]
(ignore the spaces, HTML is funny and won't allow codes within codes)
Basically anything put into a code tag will just show as text, and not the actual product of the code. If that makes sense.
So if you place an image into a code tag then the image will not be displayed, only the image tag will.
There are a bunch of icons above all the emoticons that are really useful.