I'm not sure that this is definitive, but I found this at
http://webcontrols.dotnetnuke.com/d...detail.txt
added new custom attributes to nav skin object
<!-- AnimationType: Type of Animation to use (None (default), Slide, Expand, Diagonal,ReverseDiagonal) -->
<!-- EasingType: Type of Easing to use (Bounce, Circ, Cubic, Expo (default), Quad, Quint, Quart, Sine) -->
<!-- EasingDirection: Direction of animation (In, Out (default), InOut) -->
<!-- AnimationLength: the amount of time entire animation takes to run (seconds) -->
<!-- AnimationInterval: the amount of time to wait between frame refreshes (milliseconds) -->
<!-- RenderMode: Mode to render menu in (Normal (default), NoTables (obsolete), UnorderedList, DownLevel) -->
<!-- SubMenuOrientation: Orientation of submenus (Horizontal, Vertical (default)) -->
<dnn:NAV runat="server" id="dnnNAV" ProviderName="DNNMenuNavigationProvider" CSSControl="main_dnnmenu_bar" CSSContainerRoot="main_dnnmenu_container" CSSNode="main_dnnmenu_item" CSSNodeRoot="main_dnnmenu_rootitem" CSSIcon="main_dnnmenu_icon" CSSContainerSub="main_dnnmenu_submenu" CSSBreak="main_dnnmenu_break" CSSNodeHover="main_dnnmenu_itemhover" NodeLeftHTMLBreadCrumbRoot="<img alt="*" BORDER="0" src="breadcrumb.gif"/>">
<CustomAttributes>
<dnn:CustomAttribute Name="AnimationType" Value="Slide" />
<dnn:CustomAttribute Name="EasingType" Value="Bounce" />
<dnn:CustomAttribute Name="EasingDirection" Value="Out" />
<dnn:CustomAttribute Name="AnimationLength" Value="1" />
<dnn:CustomAttribute Name="AnimationInterval" Value="10" />
<dnn:CustomAttribute Name="RenderMode" Value="Normal" />
</CustomAttributes>
</dnn:NAV>