It has to go in a custom footer (not html module) to work*. The source, which also has some interesting thoughts on the desirability of disabling right click, is below:
*Using in a custom footer:replace all code in xslt box with this:
Over 200,000 nurses are unemployed, underemployed & abused in the Philippines. Many of us are overworked but extremely underpaid. Help us gather awareness & support by changing your profile picture to pitch black from January 01-11,2011. It is time we take care of our prime care professionals! Appreciate your Nurses, take care of them - like they take care of you. Join the campaign now!