fix offset issue, closes #24

Hello @asamiller, 

Please review the following commits I made in branch 'sjkaliski-fix'.

cd302e076f50e1a0b01ce8e2e23cc95fe03b00c0 (2014-03-20 16:02:22 -0400)
fix offset issue, closes #24

74074d94d6481cbfaf10a7c8bf1730af1a63808f (2014-03-20 15:59:22 -0400)
support multiple related parameters, closes #25

- [ ] The Server JS has been reviewed

R=@asamiller