nikon d5100 & SB-700 remote flash issue

I have Nikon D40 which have have used many times with my Interfit EX150 lights using a wireless trigger to set the lights off with no problems.  I have just upgraded to a Nikon D5100 and hope to be using the same set-up with the same triggers although havent tried it yet as only had the new camera a few days - I would like to use my SB700 flash off camera as part of this set-up attached to a stand but don't know how to set it off with my current set-up - would I need to have another receiver for it?? Sorry also for coming in late on this discussion...