Disabling right click and alert message using javascript

var message="Sorry this function is disabled."

<title>Disable right click using javascript</title><script type="text/javascript">
var message="Sorry this function is disabled."
function IE4(){
if(event.button==2){
alert(message)
return false}}
function NS4(e){
if(document.layers||document.getElementById&&!document.all){
if(e.which==2||e.which==3){
alert(message)
return false}}}
function disableselect(e){
return false}
function reEnable(){
return true}
document.onselectstart=new Function("return false")
if(window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable}
if(document.layers){
document.captureEvents(Event.MOUSEDOWN)
document.onmousedown=NS4}
else if(document.all&&!document.getElementById){
document.onmousedown=IE4}
document.oncontextmenu=new Function("alert(message);return false")
</script>
<h2>Right Click On The Page</h2>