var Mac   = navigator.userAgent.indexOf("Mac") != -1   ? true : false;
function mdown(e) {
  if (navigator.appName == "Microsoft Internet Explorer") {
    if (event.button == 2 || (Mac && (event.ctrlKey || event.keyCode == 91))) {
      return(false);
    }
  } else if (navigator.appName == "Netscape") {
    if (e.which == 3 || e.modifiers == 2 || e.ctrlKey || e.which == 85) {
		return false;
    }
  } 
}
function noright(){
	return false;
}

document.oncontextmenu = noright;

if (document.all && (Mac || ! document.getElementById)) {
	document.onmousedown = mdown;
	document.onkeydown = mdown;
} else if (document.layers) {
	window.captureEvents(Event.MOUSEDOWN | Event.modifiers | Event.KEYDOWN);
	window.onmousedown = mdown;
	window.onkeydown = mdown;
} else if(navigator.userAgent.indexOf("Netscape6")!=-1){
	document.onmouseup = mdown;
	document.onkeydown = mdown;
}