Actually, it seems (at least sometimes) that they can, Neb, dear.
First off : diablo: won't work as is, it would have to be : 1diablo: or the computer will turn the first : and d into this

.
Secondly, if you want to see if it will work for you...
While looking at the smiley you want, put your mouse over it and click right. Then click on properties and copy that. Go to edit your sig in your profile and paste it in there. Then surround the resulting image location with [img] and [/img] with NO spaces. It SHOULD work then.
Edit: AAAGGGHHH! Everyone helping at the SAME TIME!

*cool*
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Alureth...Dragon friend of Breanna, Mage and Advisor in the Court of Lady Lioness
Co-Owner/Operator of the Evil Petting Zoo and devout member of the HADB clan.
Commander of the Dragon Fleet, IW Peacekeeping Force
Sublime Sister of the Illuminati - may the Light shine forever!
Second Historian and Scribe of IW. Mother Hen of IW.
Mage extraordinair, Pin-Up Girl for the OLD-COOTS
Magey-Wagey: performer in the Nekked Dancing Trio of the ORT.
Hopeless Romantic *sigh*
[This message has been edited by DragonMage (edited 10-16-2001).]