var oLastBtn=0;
bIsMenu = false;
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 !=1) 
return false; 
} 
else 
if (event.button !=1) 
{ 
event.cancelBubble = true 
event.returnValue = false; 
return false; 
} 
} 
document.onmousedown = norightclick; 
document.oncontextmenu = nocontextmenu;