How do you change the default smiley in the WYSIWYG editor?

[Akyeame Kwame]

How do you change the smiley on the text editor? I have my own image that I would like to use there but I can't seem to find where that smiley is to overwrite it. (left clicking, of course, doesn't work)

Does anyone know the path? Would it be in the standard vb files or in the custom theme images?

[Radibux]

I'm interrested too!