Wireless transmitter to surround sound speakers

My fiancee and I have moved house and brought our surround sound system with us. 3 of the satellite speakers were wired under the living room floor of the old house but we don't have that option in the new house.

Current set-up is we have the red and white audio lead from the TV inputting to a central unit. From this unit you have outputs for the sub woofer, central unit and 4 satellite speakers. The woofer, central unit and one of the satellites sit near the TV and so can be wired up without too much mess but I want to place the other 3 speakers in the corners of the room without tracking wires everywhere.

I'm thinking there must be a way to wirelessly transmit from the central unit to each of the 3 speakers. Any ideas what kit I need? Which companies make this kind of stuff?