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1. I would try putting it in your footer which is available in all pages. I will also try and join one myself and see what happens out of interest
2 You can paste javascript code into the theme.html normally between the tags.
You may be aware of the following issues already, but there is no way to keep your pictures protected once they're online. The bottom line and say that the Google-bot, once it visits your site, records all images on the page, so that anyone can access it on the Google image search.
Also, the Javascript right-click block is known to be very inefficient. When visitors see that you have something to protect, they'll be more persistant on trying to get the image.
I think the best way to protect them is a watermark. It won't stop people from downloading it, but it will stop them from using it as their own.
Later versions of Internet explorer also have a toolbar which appears as soon as you move your mouse over the pic, the menu appears for "save pic" etc, very irritating..this ignores and overrides any no-right click code.
You can also just do a print screen and cut it out with abobe photoshop
But I have some code I got somewhere to type into your theme.html file if you think it would help. This one has a popup message, which some people may again find a nuisance..various free javascript codes are available if you do a google search..