can i hide a smiley from the emoticons box

can i hide a smiley from the emoticons box so only people who know about can use it

http://www.webartzforum.com/t973-the-add-us-box
You can add something similar in a widget & add the permission of the widget to a certain group. The code inside would be a html code to display a image. Something like this will do. They can copy paste this code then.

Code:

<img src="http://r29.imgfast.net/users/3412/19/22/63/smiles/103182.gif">