don't apply static hover style to siteMapNode that has an empty url property

Hi,
I was wondering if there is any way to not apply the static hover effect to asp:menu items where their corresponding sitemapnodes don't have a url specified?
It sounds a little confusing so I thought I'd add snippets of what I'm trying to do:


I have a sitemap file with 3 levels:

<?xml version="1.0" encoding="utf-8" ?> <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" > <siteMapNode url="~/default.aspx" title="SOME TITLE" description=""> <siteMapNode url="" title="Admin" description="" roles="Admin"> <siteMapNode url="~/admin/userMgmt.aspx" title="User Mgmt" description="" /> <siteMapNode url="~/admin/roleMgmt.aspx" title="Role Mgmt" descr ...