Set Tool Tips for Tabs?

<script>
    var obj = new AW.UI.Tabs;
    obj.setItemText(["Home", "Favorites", "Font size", "Search"]);
    obj.setItemImage(["home", "favorites", "fontsize", "search"]);
    obj.setItemCount(4);
    obj.setSelectedItems([0]);
  obj.setItemTooltip(["Tip for Home", "Tip for Favorites", "Tip for Font size", "Tip for Search"]);
    document.write(obj);
</script>