Only allow certain wesites on XP

Hello,

I for some reason have not been able to find anything out about this on the internet so I am wondering if anyone here can help. My five year old son has his computer that he plays online kids games on and I am wondering if there is a way to block all websites on his computer except for the 2 or 3 that I will allow him to go to, this way I know that he won’t accidentally go to a bad site or a site with spyware etc. Any help would be much appreciated.

Thanks