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;