just on a quick search I found something on another site reguarding this topic:
http://www.freeminds.org/doctrine/baptism.htm
this is found about half way down:
In line with these sentiments, in 1985 the Society changed the baptismal vows such that new Jehovah's Witnesses committed themselves not only to God, but to the Watchtower Society. This is evident from the baptismal vows published over the years. The baptismal questions from the Aug. 1, 1966 Watchtower (p. 465) were:
(1) Have you recognized yourself before Jehovah God as a sinner who needs salvation, and have you acknowledged to him that this salvation proceeds from him, the Father, through his Son Jesus Christ?
(2) On the basis of this faith in God and in his provision for salvation, have you dedicated yourself unreservedly to God to do his will henceforth as he reveals it to you through Jesus Christ and through the Bible under the enlightening power of the holy spirit?
The May 15, 1970 (p. 309) and May 1, 1973 (p. 280) issues printed slightly revised vows. The newest baptismal questions were set forth in the June 1, 1985 (p. 30) Watchtower:
(1) On the basis of the sacrifice of Jesus Christ, have you repented of your sins and dedicated yourself to Jehovah to do his will?
(2) Do you understand that your dedication and baptism identify you as one of Jehovah's Witnesses in association with God's spirit-directed organization?
Note how different the second vow is from the earlier versions. The Society has managed to get newer members to, in effect, join a worldly club from which their membership can be terminated at any time by the Society (disfellowshipping) while at the same time convincing these newcomers that they have only dedicated themselves to their Creator. Can any actions be more devious?