if (window.Event) 
document.captureEvents(Event.MOUSEUP); 
function nocontextmenu() 
{event.cancelBubble = true
event.returnValue = false;
return false; }
function norightclick(e)
{if (window.Event) {
if (e.which == 2 || e.which == 3)
return false; }
else
if (event.button == 2 || event.button == 3)
{event.cancelBubble = true
event.returnValue = false;
return false;} }
document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;