As all people with the right answer got a thumb down, (someone who does not know thinks he is smart?) here a link to a site that explains all.
http://en.wikipedia.org/wiki/Capital_of_the_Netherlands
Amsterdam is the capital of the country.
The Hague is the governmental seat, not the capital.
And the provincial capital of the province Amsterdam is in is Haarlem, so Amsterdam only has the city council, not any more important one. But Capital even so.
PS,
Zwink,
You are a bit behind, Juliana lived in Soestdijk,
Beatrix in 's-Gravenhage, Huis Ten Bosch, from 13 august 1981
( http://www.parlement.com/9291000/biof/10001 )