i believe your only option is to [_*put your iPad into recovery-mode*_|http://www.ipadforums.net/ipad-help/2987-how-put-your-ipad-into -recovery-mode.html#post22560] and start from scratch.
as the read points out, +*if you had previously backed up your iPad, iTunes will tell you there is a backup and ask if you would like it restored+*
good luck !
J
GG