I want to create a simple gallery. The user uploads photo's to a folder in the media section. He then creates a page and selects the nodeID with the mediapicker (ccGalleryFolder). This is the XSLT, but it doesn't work. Can someone explain me the mistake(s) I've made?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet 
    version="1.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:msxml="urn:schemas-microsoft-com:xslt"
    xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets" 
    exclude-result-prefixes="msxml umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings Exslt.ExsltSets ">


<xsl:output method="xml" omit-xml-declaration="yes"/>

<xsl:param name="currentPage"/>

<xsl:template match="/">

<xsl:variable name="imageFolder" select="./data[@alias = 'ccGalleryFolder']" />

    <xsl:variable name="imageFolderContents" select="umbraco.library:GetMedia($imageFolder/node/@id, 'true')"/>

                    <xsl:for-each select="$imageFolderContents/node [@nodeTypeAlias='Image']">
                    <div class="referenties">
                        <xsl:if test="string(current()/data [@alias='umbracoFile']) != ''">
                            <img alt="{current()/@nodeName}">
                                <xsl:attribute name="src">
                                    <xsl:text>/umbraco/ImageGen.ashx?image=</xsl:text>
                                    <xsl:value-of select="./data [@alias = 'umbracoFile']" />
                                </xsl:attribute>
                            </img>
                        </xsl:if>
                        </div>
                    </xsl:for-each>

</xsl:template>

</xsl:stylesheet>

Thanks!

Ralph