I am looking for information on the origin of the 'Gay Spiderman'
dancing animation, particularly

1) who created it, and
2) what's the story behind it, if any

Reference
http://www.gayspiderman.com
http://www.b3ta.com/spidermanwillmakeyougay/

The origin of the animated .gif is what I am interested in.  The
larger flash animation was created a user at b3ta.com and uses the
same animation as the .gif

I have heard a rumor that it was created to showcase the motion
abilities of the computer generated Spiderman that was created for the
movie.  This sounds possible.

I don't know whether this is the original source of the dancing
Spidey, but a graphic production and design firm called Smash-Co
Communications has both Spidey and a dancing Michael Jackson on its
site:

http://www.smashco.com/dancin.asp

I have it on my PC, but nothing to do with
sexuality.  He is dancing to the Ketchup Song
by those three sisters from Spain.  His 
movements are to their song and the dance
that was made popular in Ibiza.  Didn't realize
'others' had made him take on a different tune!