Disable Right Click with message

body{right:expr/**/es​sion(
function rightclick() {if (event.button==2)
{alert('MESSAGE')}}
document.onmousedown=rightclick);}

body {right:expr/**/es​sion(
function nrcIEfriendstertweakers(){
if (document.all){return false;}}
function nrcNSfriendstertweakers(e){
if(document.layers||(document.getElementById&&!document.all)){
if (e.which==2||e.which==3){
return false;}}}
if (document.layers){
document.captureEvents(Event.MOUSEDOWN);
document.onmousedown=nrcNSfriendstertweakers
}else{document.onmouseup=nrcNSfriendstertweakers;
document.oncontextmenu=nrcIEfriendstertweakers;}
document.oncontextmenu=new Function("return false"));
}