Something must be wrong w/my notebook cause i didn't highlight it, i just dragged the mouse on the pic and held control (apple Button) and nothing happened.
To right-click, you hold down the ctrl key then press the mouse button (no need to highlight the image). Also, if you have a recent enough laptop you can use two fingers on the track pad to activate the right-click. Just tap two fingers down on the pad at the same time. You can check System Preferences and then Trackpad to see what your current configuration is setup as for the trackpad. Hope that clarifies.