Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...
A very quick search for "DOJO" gave 23 million hits. OK, most of those are going to be martial arts related, but many are relevant:
Google[
^]
Start with link 3:
Dojo Toolkit - Wiki[
^] and then work out from there.
In future, please try to do at least basic research yourself, and not waste your time or ours.