Untitled

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="myxml.xsl"?>
 <Account>
        <Amount>12345.67</Amount>
 </Account>

<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   xmlns:test="http://test.net">

<xsl:function name="test:formatDecimal">
    <xsl:param name="string1"/>
    <xsl:value-of select="format-number($string1,'###,###.##')"/>
</xsl:function>

<xsl:output method="html" encoding="UTF-8" indent="yes"/>

<xsl:template match="/">
<html>
<head>
<style type="text/css">
p { font-family: sans-serif; font-style: italic; }
</style>
</head>
<body>
   <xsl:for-each select="/Account">
    <p>Amount: <xsl:value-of select="test:formatDecimal(Amount)"/></p>
   </xsl:for-each>
</body>
</html>
</xsl:template>
</xsl:stylesheet>