Hello, i'm trying to get a parameter "urlName" from media, and display it by a razor macro

So i got my umbraco config like this, and what's in bold is what i want

<DAMP fullMedia="">

              <mediaItem>

                <MultipleImage id="1135" version="6f8a3e4f-a557-4e6f-a7d9-216cead8e183" parentID="1122" level="3" writerID="0" nodeType="1134" template="0" sortOrder="1" createDate="2011-09-05T12:12:29" updateDate="2011-09-05T12:12:30" nodeName="Paysage" urlName="paysage" writerName="Admin" nodeTypeAlias="MultipleImage" path="-1,1121,1122,1135">

                  <image>/media/286/chrysanthemum.jpg</image>

                </MultipleImage>

              </mediaItem>

            </DAMP>

My macro looks like this :

@{
    dynamic mediaItem = new umbraco.MacroEngines.DynamicMedia(Parameter.photoId);
}
<div>
<img src="@mediaItem.Image"/>
<p>@mediaItem.urlName</p>
</div>