Question : Router website blocking

Is there a way to change the default message on my router when I block a website?  Right now it just says:
401 The web site is blocked by administrator

I want to make it a little less obvious.
I am running  D-Link DI-604 Router right now.

If it's not possible, then can I block sites using XP Pro?  If so does the same message display?

Answer : Router website blocking

401
This is an error message from the server not the router theres no way to change it.