Disabled Right click (with alert)

<script language=JavaScript>
<!--


//Disable right mouse click Script
//By Maximus (maximus@nsimail.com) w/ mods by DynamicDrive
//For full source code, visit http://www.dynamicdrive.com


var message=" right click nak watpe?";


///////////////////////////////////
function clickIE4(){
if (event.button==2){
alert(message);
return false;
}
}


function clickNS4(e){
if (document.layers||document.getElementById&&!document.all){
if (e.which==2||e.which==3){
alert(message);
return false;
}
}
}


if (document.layers){
document.captureEvents(Event.MOUSEDOWN);
document.onmousedown=clickNS4;
}
else if (document.all&&!document.getElementById){
document.onmousedown=clickIE4;
}


document.oncontextmenu=new Function("alert(message);return false")


// -->
</script>