Static bar with collapsible windows

I need a static bar at the bottom of a website (Joomla) that follows when user scrolls up and down. This bar will have two types of buttons: 1 - Popup window that will display a webpage (simple chat). It is very important that this popup is not reloaded everytime user minimizes the window and then re-opens it (or during normal site browsing). The user must always maintain connection to chat even if window itself is not shown. 2 - Simple link that opens up a page in the current place ("_parent", not popup). Please view this images for better understanding: [login to view URL] [login to view URL] [login to view URL] [login to view URL] Other requirements: - When scrolling the bar must follow "smoothly", no jumping around. - It should be easy to add new icons/buttons to bar. - It must be possible to set popup windows size (different for different button). Automatic (full screen) or own setting.