UrlRewriting rule problem

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Hi this is my website root:

default.aspx
services.aspx
contact.aspx
services\building.aspx
services\general.aspx
services\costs.aspx

I have a problem with my rewriting rules (I'm using Intelligencia.UrlRewriter):

<rewriter>
    <rewrite url="~/default" to="~/default.aspx" />
    <rewrite url="~/contact" to="~/contact.aspx" />
    <rewrite url="~/services" to="~/services.aspx" />       

    <rewrite url="~/services/building" to="~/services/building.aspx" />
    <rewrite url="~/services/general" to="~/services/general.aspx" />
    <rewrite url="~/services/costs" to="~/services/costs.aspx" />
</rewriter>

Basically when I try to access to the pages inside the "services" folder, the rewrite engine does not work and the page is not loaded. I think is something up to that folder and that file wich share the name. Any hints?