congratulatory

from WordNet (r) 3.0 (2006)

congratulatory
    adj 1: expressive of sympathetic pleasure or joy on account of
           someone's success or good fortune; "a congratulatory
           telegram"; "the usual congratulatory crowd was
           conspicuously absent"; "a gratulatory address" [syn:
           {congratulatory}, {gratulatory}]

from The Collaborative International Dictionary of English v.0.48

Congratulatory \Con*grat"u*la*to*ry\, a.
   Expressive of sympathetic joy; as, a congratulatory letter.
   [1913 Webster]