I haven't tried it, but these pages offer suggestions on how to bypass the restriction.
http://www.onetipaday.com/2007/10/17/how-to-download-images-when-right-click-is-disabled/
http://www.astahost.com/solution-disabled-right-click-web-page-t6318.html
http://www.researchfellow.net/ftopic351.html