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))
	{
		return false;
	}
		return true;
}

function key(k)
{
	if(isie) {
		if(event.keyCode==17 || event.keyCode==18 || event.keyCode==93) {
			return false;
		 }
	}

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