function rollTab(name,over) {
  if(window.document.images) {
    
    if (over) window.document.images[name].src = "/images/nav/" + name + "_over.gif";
	else window.document.images[name].src = "/images/nav/" + name + "_off.gif";
  }
}

function openWindow(url, width, height) {
  var popup = window.open(url, 'Popup',
    'width=' + width + ',height=' + height + ',menubar=yes,toolbar=no,resizable=no,scrollbars=no');
  if (popup.blur) popup.focus();
  if (popup.focus) popup.focus();
}