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;