Live chat facility

We are providers of various software systems to various clients in different countries. We are looking for someone to supply us with a Live Chat software to put on our website to provide efficient online support. WE require the following; 1) live chat software 2) it will be registration based, in other words, we only register those we want to chat to so that its not open to everyone and to abuse 3) we keep and maintain the history of the chats 4) job should be delivered in 2 days The provider must give us references of similar work and should proove that they are the ones who did the referenced work. Payment will be held in escrow and released upon satisfactory completion of the job and delivery of the source code. Please note, timings agreed at the start of the job must be stuck to otherwise the project will be cancelled if it is delayed beyond agreed time.