Add Instant Messenging Chat System to Website

When users hit a landing page, host must be alerted via audible alert, blinking page tab, text message, email, etc. Host then chats with user in real-time. If there are more than one visitor to the page at once, then each visitor must be allowed to chat with host, but not with each other. No group chat. System should work similar to MSN Instant Messenger, but should be proprietary to our website. We are not interested in Meebo, etc., which serves as a plugin for many chat systems and Instant Messenging systems. All chat discussions should be saved on our server, and not a third party vendor. If you know of a solution, either open source or otherwise, or can program a proprietary solution for us, then please contact us immediately by placing your bid immediately.