function right(e) {
	var errmsg = "Sorry, you don't have permission to right-click.";
	if (navigator.appName == 'Netscape' && e.which == 3) {
		alert(errmsg);
		return false;
	}
	if (navigator.appName == 'Microsoft Internet Explorer' && event.button==2) {
		alert(errmsg);
		return false;
	}
	else return true;
}

function disableclick() 
  {
  if(document.images)
    {
    for(i=0;i<document.images.length;i++)
      {
      document.images[i].onmousedown = right;
      document.images[i].onmouseup = right;
      }
    }
  }