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;*/
		var isNS = (navigator.appName == "Netscape") ? 1 : 0;
		if(navigator.appName == "Netscape") document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);
		function mischandler(){
		return false;
		}
		function mousehandler(e){
		var myevent = (isNS) ? e : event;
		var eventbutton = (isNS) ? myevent.which : myevent.button;
			if((eventbutton==2)||(eventbutton==3))
			{
				//alert("Sorry, you do not have permission to right click on this page.");			
				return false;
			}
		}
		document.oncontextmenu = mischandler;
		document.onmousedown = mousehandler;
		document.onmouseup = mousehandler;
}

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)
	{
		if(k.keyCode==17 || k.keyCode==18 || k.keyCode==93)
		{
			
			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;