PHP/JQuery apps and Google Calendar synchronization

This is a project to create a feature that synchronizes calendar information between a custom calendar module for SugarCRM and Google calendar. The custom calendar module for SuagrCRM is demonstrated at SugarForge ([login to view URL]). The module has Ajax'ed UI with JQuery but basically the synchronization happens in a database layer. The tasks will include following things. 1. Develop a architecture to synchronize calendar information (meeting / call / task) between the module above and Google Calendar. Synchronization means that a new/modified event is synchronized and a deleted event should be deleted on both sides. 2. Develop a personal option for each user of SugarCRM to define if each of meeting / call / task is synced, a time slot (month) when events are synchronized.