AJAX IM with userdatabase, loginform and messages database needed

Develop a simple userdatabase to AJAX IM which contains the fields username; password (md5 security);llast login ( timestamp ) --> no sign in form is needed, users will be edited with phpmyadmin Write a simple loginpage where users out of database can login to a page that conains the AJAX IM client, when users login AJAX IM Client should be started, the page have to include a logout button and a simple session management AJAX IM Client have to show all online users of this page AJAX IM Client have to show the usernames of the online users AJAX IM Chat function have to work fine with this features Add a database that saves the conversation of the users, so the conversation should not be lost when user logout and when a user get a message and he is not online the message should be saved in this database