razveseliti

1. (+ acc.) to cheer up; to make happy
   Tvoja poruka me je baš razveselila. — Your message really cheered me up.
   Kupio je cveće da razveseli mamu. — He bought flowers to cheer up his mom.
2. (razveseliti se) to cheer up; to be delighted
   Deca su se razveselila kad su videla sneg. — The kids were delighted when they saw the snow.
   Razveselio se poklonu kao malo dete. — He was as happy about the present as a little kid.

Razveseliti se usually takes the dative for the cause of joy: razveselio se poklonu.