You'll have to login to your router configuration page and unblock the site. Generally this happens when you first set up your router or when your router needs a firmware update...or when your dad doesn't want you going on myspace. Consult your router manual on how to login to it and unblock pages. Netgear routers generally have IP addresses of 192.168.0.1.
Googled this and came about this thread. How do you log in to your router configuration page? I have no idea what that means