var timer = setInterval ( "trap()", 500 );
function trap() {
var imgs = document.getElementsByTagName("img");
	for(i=0;i<imgs.length;i++)
	{
		imgs[i].oncontextmenu = function()
			{
				return false;
			} 
	}
}

function stopRClick()
{
	clearInterval ( timer );
	trap();
}