I would always right click the image and see what choices I had. It is usually COPY or SAVE IMAGE AS in IE.
And, the same thing works in FF 4, and there are even more choices.
Why is this such a problem with Opera? Every other browser I know of has this simple--can't believe I have to call it this!--feature! Ridiculous.In FF alt-click will save the target image for a link/thumbnail. I don't know of a quick way to save the current image.