// JavaScript security
var isnn,isie
if(navigator.appName=='Microsoft Internet Explorer') //check the browser
{ isie=true }

if(navigator.appName=='Netscape')
{ isnn=true }

function right(e) //to trap right click button 
{
if (isnn && (e.which == 3 || e.which == 2 ))
return false;
else if (isie && (event.button == 2 || event.button == 3)) 
{
alert("Sorry, you do not have permission to right click on this page.");
return false;
}
return true;
}

function key(k) 
{
if(isie) {
if(event.keyCode==17 || event.keyCode==18 || event.keyCode==93) {
alert("Sorry, you do not have permission to press this key.") 
return false;
} 
}

if(isnn){
alert("Sorry, you do not have permission to press this key.") 
return false; } 
}

if (document.layers) window.captureEvents(Event.KEYPRESS); 
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (document.layers) window.captureEvents(Event.MOUSEUP);
document.onkeydown=key; 
document.onmousedown=right;
document.onmouseup=right;
window.document.layers=right;