Parked Domain Permalinks

Hi guys,

WordPress is hosted on my primary domain at: http://headrush.in/corporate-events/outbound-learning/

Another domain – teambuildingactivities.in is parked, ie. points to headrush.in. Therefore, if someone goes in http://teambuildingactivities.in/corporate-events/outbound-learning/ they’ll be served the blog from my primary domain. However, how do I get the permalinks to point to the existing domain?

ie. when on headrush.in, all the wordpress permalinks should point to headrush.in, and when on teambuildingactivities.in, all the permalinks should point to teambuildingactivities.in?