Alerts if you have a PM in the lower right corner so it's not in the way. Dialogue matches theme. Small and attempts to alert how many messages are available while using proper grammar when referencing only one alert. Saves in cookies. Cookies are account specific. Will not show on inbox pages. Once a button is hit, the popup will not show again until all current pm alerts are read. That will clear the cookie and alert the user next time they have a new pm.