IIS URL Rewrite - redirect to default image if not found

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="Image not found - redirect to default one" stopProcessing="true">
                    <match url="^.*\.(jpg|png|gif)$" />
                    <conditions>
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                    </conditions>
                    <action type="Redirect" url="http://img1.rabota.com.ua/static/2013/11/img/transparent.gif" appendQueryString="false" redirectType="Temporary" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>