Ajax overlay loader question on http://en.rsp-germany.com

A client has asked if we can provide a function on their site that is similar to what is on the left side (header area) on every page of http://en.rsp-germany.com/. It is really cool, with a popout slide form for request a call, write an email, or arrange a meeting. It appears to be be using ajax, but I cannot locate the plugin that is being used. Does anyone know where I can find this plugin?

Thanks in advance.