Is there any way to make a UNIQUE index case insensitive in Mysql 5.1.x ?

If so - What must change in this table ?

CREATE TABLE  contestants 
( 
  idContestants  int(10) unsigned NOT NULL AUTO_INCREMENT,
  idEvent        int(10) unsigned NOT NULL,
  ContestantName  varchar(50) DEFAULT NULL,
  PRIMARY KEY (idContestants),
  UNIQUE KEY Index_UniqueName (idEvent,ContestantName),
)
ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1;