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;
var message="";//Disable rightclick
function clickIE()
{
    if(document.all)
    {
        (message);
        return false;
    }
}
function clickNS(e)
{
    if(document.layers||(document.getElementById&&!document.all))
    {
        if(e.which==2||e.which==3)
        {
           (message);
           return false;
        }
    }
}
if(document.layers)
{
    if(isnn)
	{
        document.captureEvents(Event.MOUSEDOWN);
        document.onmousedown=clickNS;
    }
}
else
{
    document.onmouseup=clickNS;
    document.oncontextmenu=clickIE;
} 
document.oncontextmenu=new Function("return false")