Develop an Instant Messaging and integrate it with my Community Portal

I am currently running a Community Portal created in PHP/MySQL and would like to have an Instant Messaging integrated into it. The features I like to have and design are similar to this one: [login to view URL] Please visit the link above before bidding. I will make payment only when the project is completed. In addition, I can do anything I want to the script as I pleased (including but not limited to making more modifications, selling it, etc...) After completion of the script, it should be accompanied by an install script to make installation easier and I will do all the installation as a learning experience, in case I need to move server or reinstall the script. After integration to my current portal, I plan to integrate it to other portals available... So additional project will be added to this one. Please only bid if you're interested. I will PM link to my site at your request after looking at the IM link above.