Edit smileys in symbols

[onesterud]

Hey!
I've noticed the smileys at page 13/13 in the SMS Symbol mode and I was wondering which file i should edit to add some more to the empty spaces. Is this even possible?

Here's what i mean:
http://img401.imageshack.us/img401/1686/smilela9.jpg

And im using the classic phone keyboard layout:
http://img401.imageshack.us/img401/4082/screen01hb3.jpg

[onesterud]

This must have been a stupid question..
Or can it be that no one knows how to do?
Im hoping for an answer, cause i haven't managed to find it out by my self yet =)