This page uses the “Nivo template” where the header image is replaced by the oik-nivo-slider. The images that are displayed in the slider are attached to the page using Add media.
The nivo2011 theme is a child theme of the Twenty Eleven WordPress theme.
Images in the Nivo slideshow
See also
nivo2011 WordPress theme WordPress.org – Twenty Eleven – FREE WordPress Theme oik-nivo-slider oik