The applet shows a morph between an basal conformation (based on the X-ray structure of bovine rhodopsin) and an activated conformation (based on the X-ray structure of opsin).
The structure is displayed by Jmol software. The interpolation and energy minimization for the morph were done by the Morph Server of Gerstein & Krebs at Yale Univ

Rotation: Left-click in the structure
Zoom in and out: mouse wheel, or Shift + Left mouse button.
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Click on one or more residues and then on this Button change the color of a specific residue: