I am using MS Project Server 2010, in project web app (PWA) + Quick Launch +
"Personal Settings" we can set Task Alerts.
The following options are available related to task Alerts .

Task Alerts

Alert me when team members;

- Submit new tasks and Assignments

- Reassign Tasks

- Update Tasks


I want to set Alerts on a specific task with different conditions .... (50%
completed or 100% completed)

Can anybody tell me that how can customized Tasks Alerts....