http://www.dynamicdrive.com/dynamicindex9/noright2.htm [...] is supposed to be able to stop someone from right-clicking on the pic to steal it or whatever
i'm not 100% if this is a bug or just an easy way to defeat the disabled ability of right-clicking on a picContext-menu blockers have never been reliable, and never will be. Anyone who believes otherwise is ignorant of the facts (fair enough for 'average' users), or deluding themselves.
The method you describe is not the only way: there are many. The simplest in Firefox is to right-click on the image and, leaving the cursor where it is, press the spacebar to dismiss the alert box. The context-menu will now appear at the location of the cursor.
Another, for any browser, is to run the following bookmarklet:
javascript:document.onmousedown=document.onmouseup=null;for(var i=0;document.images.length>i;++i)document.images[i].onmousedown=null;void(0);Similar bookmarklets can be used for every other context-menu blocker ever written.
Mike