I resolve using this script
[getmyroot_py]
request = container.REQUEST
if request.has_key("VirtualRootPhysicalPath"):
s=""
else:
s=request.BASE2
return s
[menu]
<dtml-let myroot="getmyroot_py">
<ul id="nav">
<li>
<a href="&dtml-myroot;/finanza/