Disabling Right Click on OBIEE with JS

To disable mouse right click in OBIEE dashboards.Place the following Java script in dashboard.
  
<script language=JavaScript>
<!--
var message="Right click Disabled!";

function clickIEbrowser4(){
if (event.button==2){
alert(message);
return false;
}
}
function clickNSbrowser4(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=clickNSbrowser4;
}
else if (document.all&&!document.getElementById){
document.onmousedown=clickIEbrowser4;
}
document.oncontextmenu=new Function("alert(message);return false")
</script>