want to add smilies in rich text editor

hi, all i want to add smilies in my rich text editor which is in java script i want to use my existing rich text editor. or can you pl provide me the source code of any other rich text editor so that i can modify my editor. just like when we write a post here in dot net we find a editor with smilies option i want some thing like this its been days searching the net but i can't find a proper one
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