exclude folders from a rewrite rule in IIS 7

Hi,

I have a site that needs url rewriting. I already managed to get the following working:

* www.atlanta.com/sounddesign --> rewritten as --> www.atlanta.com/?category=sounddesign
* www.atlanta.com/sounddesign/1234 --> rewritten as --> www.atlanta.com/?category=sounddesign&item=1234

My problem is that the website relies on css ans js files that are located in the directories /js en /css on the same webroot, so I need to exclude these in the rules or these links also get rewritten unintentionally.
In short, I need to achieve this:

* www.atlanta.com/js/ --> not rewritten
* www.atlanta.com/css/ --> not rewritten

I've been experimenting with this for quite some time now, but can't get it right.
Attached you'll find my web.config file.

Any help is highly appreciated!

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <outboundRules>
                <preConditions>
                    <preCondition name="ResponseIsHtml1">
                        <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" />
                    </preCondition>
                </preConditions>
            </outboundRules>
            <rules>
                <rule name="RedirectUserFriendlyURL1" enabled="true" stopProcessing="true">
                    <match url="([_0-9a-z-]+)" />
                    <conditions>
                        <add input="{REQUEST_METHOD}" pattern="^POST$" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="/?category={R:1}" appendQueryString="true" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

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