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multiple websites on one umbraco, xslt macro required?
<umbraco:Macro Alias="MyMacro" runat="server" MyParam="Hello, world" />

<xsl:value-of select="/macro/MyParam" />

<!-- this gets the domain name -->
<xsl:variable name="domainName">
    <xsl:value-of select="umbraco.library:RequestServerVariables('HTTP_HOST')" />
</xsl:variable>

<!-- determine which banner to show -->
<xsl:choose>
    <xsl:when test="$domainName = 'www.websiteone.com'">

        <!-- get the node for website one -->
        <xsl:variable name="websiteOneHeaderNodeId" select="1001" />
        <xsl:variable name="websiteOneHeaderNode" select="umbraco.library:GetXmlNodeById($websiteOneHeaderNodeId)" />

        <!-- display the banner for website one -->
        <img src="{$websiteOneHeaderNode/banner}" />

    </xsl:when>
    <xsl:when test="$domainName = 'www.websitetwo.com'">

        <!-- get the node for website two -->
        <xsl:variable name="websiteTwoHeaderNodeId" select="1002" />
        <xsl:variable name="websiteTwoHeaderNode" select="umbraco.library:GetXmlNodeById($websiteTwoHeaderNodeId)" />

        <!-- display the banner for website two -->
        <img src="{$websiteTwoHeaderNode/banner}" />

    </xsl:when>
    <xsl:otherwise>

        <!-- display the default banner -->
        <img src="/media/1001/defaultBanner.jpg" />

    </xsl:otherwise>
</xsl:choose>

<xsl:value-of select="$currentPage/ancestor-or-self::Site/bannerUrl" />