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

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

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