Inspect the properties of the emoticons images, normaly it's
http://localhost:8080/jforum/images/smilies/
Look at template/default/post_form.htm
and template/default/list_smilies.htm
But if you want to change the smilies location, it seems you must change the database script (?)
A Jforum developper should help you better than me.
[originally posted on jforum.net by zwibir]