document.onmousedown=right; 
document.oncontextmenu = nocontextmenu; 
if (document.layers) window.captureEvents(Event.MOUSEDOWN) 
if (window.Event) document.captureEvents(Event.MOUSEUP); 
window.onmousedown=right; 

function right(e) 
{ 
if (navigator.appName == 'Netscape' && (e.which == 2 || e.which == 3)) return false; 
else if (navigator.appName == "Microsoft Internet Explorer" && (event.button == 2 || event.button == 3)) 
{ 
event.returnValue = false; 
return false; 
} 
} 

function nocontextmenu() 
{ event.cancelBubble = true 
event.returnValue = false; 
return false; 
}