<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [<!ENTITY nbsp " ">]>
<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:msxsl="urn:schemas-microsoft-com:xslt"
  xmlns:aqua="urn:schemas-my-org:aqua"
  xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings"
  xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath"
  exclude-result-prefixes="msxml Exslt.ExsltMath Exslt.ExsltStrings aqua umbraco.library">

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

  <xsl:param name="currentPage"/>

  <xsl:variable name="StartNode" select="/macro/StartNode/node/@id" />
  <xsl:variable name="NumberOfImages" select="/macro/NumberOfImages" />
  <xsl:variable name="parent" select="umbraco.library:GetMedia($StartNode, 'false')" />
  <xsl:variable name="randomNumbers" select="aqua:random($NumberOfImages, count($parent/node))"/>

  <xsl:template match="/">

    <xsl:for-each select="$randomNumbers/numbers/number">

      <xsl:variable name="randomPosition" select="."/>

      <xsl:for-each select="$parent/node">

        <xsl:variable name="parentPosition" select="position()"/>

        <xsl:if test="$parentPosition = $randomPosition">

          <xsl:if test="./data [@alias = 'umbracoExtension'] = 'gif' or ./data [@alias = 'umbracoExtension'] = 'jpg' or ./data [@alias = 'umbracoExtension'] = 'jpeg' or ./data [@alias = 'umbracoExtension'] = 'png'">

            <div class="Random{$currentPage/@nodeName}Image">

              <xsl:element name="img">
                <xsl:attribute name="src"><xsl:value-of select="./data [@alias = 'umbracoFile']"/></xsl:attribute>
                <xsl:attribute name="alt"><xsl:value-of select="@nodeName"/></xsl:attribute>
                <xsl:attribute name="width"><xsl:value-of select="./data [@alias = 'umbracoWidth']"/></xsl:attribute>
                <xsl:attribute name="height"><xsl:value-of select="./data [@alias = 'umbracoHeight']"/></xsl:attribute>
              </xsl:element>

            </div>

          </xsl:if>

        </xsl:if>

      </xsl:for-each>

    </xsl:for-each>

  </xsl:template>

  <msxml:script language="CSharp" implements-prefix="aqua">
  <msxml:using namespace="System.Collections.Generic" />
  <msxml:using namespace="System.IO" />
  public XPathNodeIterator random(int numMin, int numMax)
  {
    int i;
    Random random = new Random();

    List&lt;int&gt; numbersList = new List&lt;int&gt;();

    for (i = 1; i &lt; numMax + 1; i++)
    {
      numbersList.Add(i);
    }
    int numRange = numMax - numMin;

    for (i = 0; i &lt; numRange; i++)
    {
      int index = random.Next(0, numbersList.Count);
      numbersList.RemoveAt(index);
    }
    StringBuilder stringBuilder = new StringBuilder("&lt;numbers&gt;");

    foreach (int item in numbersList)
    {
      stringBuilder.Append("&lt;number&gt;");
      stringBuilder.Append(item.ToString());
      stringBuilder.Append("&lt;/number&gt;");
    }
    stringBuilder.Append("&lt;/numbers&gt;");

    StringReader stringReader = new StringReader(stringBuilder.ToString());
    XPathDocument xPathDocument = new XPathDocument(stringReader );
    XPathNavigator xPathNavigator = xPathDocument.CreateNavigator();

    XPathExpression xPathExpression = xPathNavigator.Compile("/");

    XPathNodeIterator xPathNodeIterator = xPathNavigator.Select(xPathExpression);

    return xPathNodeIterator;
  }
  </msxml:script>

</xsl:stylesheet>

Alias: StartNode
Name: Start node
Type: mediaCurrent

Alias: NumberOfImages
Name: Number of images
Type: number