[IMG UBB off] Just means that the IMG tag in UBB code is disabled so that pictures can't be posted.
I don't know whether Heather personally has anything against using Smilies from other boards, but please be aware that what you are doing there is robbing someone else's probably costly bandwidth and hence poor netiquette.
If you want to use these other smilies, I'd recommend that you save them to your harddrive and then upload them to your own website and link to it there, so that the other UBB owner is not affected (apart from the copyright infringement of his or her possibly self-designed Smilies).
~spanking new Scarleteen Sexpert~
"We must become the change we want to see."