Just open the photo that you want to save and run the following script in in the address bar ( Address bar is the place where you write www.orkut.com) and hit Enter.
Have a look :
When you will hit enter you will be redirected to a page like this :
You will be redirected to a new page from where you can simply save the image by right clicking on it and selecting Save Image As.
Credits : Mr. Nobody (http://desitechmasti.com)