Your link is broken. :)
Also, what game are you playing in the picutre above? It kind of looks like Super Smash Brothers, but it's at too much of an angle..
The link is actually "forbidden", I forgot that site doesn't allow direct linkage. Anyway, I've attached it below (keep in mind it's 4 years old, so the quality may be bad).
Also, yes, the picture is from Halloween of 2005 I believe. I was the store manager at a GameStop in a local mall and we hosted a DDR Mario Mix tourney the same night. We gave away candy to the top dancers and best costume. I also made a fool of myself and played the game dressed as Mario. One of my friends from work had a video, I'll have to see if he still has it....