Disable Right Click webpage by JavaScript, ASP.Net

<script type="text/javascript">

<!--

var message="Disabled";

 

///////////////////////////////////

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>

  

<script type="text/javascript">

function disableSelection(target){

if (typeof target.onselectstart!="undefined") //For IE

 target.onselectstart=function(){return false}

else if (typeof target.style.MozUserSelect!="undefined") //For Firefox

 target.style.MozUserSelect="none"

else //All other route (For Opera)

 target.onmousedown=function(){return false}

target.style.cursor = "default"

}

   

</script>