Calling functions in XSL

<xsl:stylesheet xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
indent-result="no" default-space="strip">
<xsl:template match="/booklist">
 <xsl:value-of select="book/code"/>
 <xsl:value-of select="book/code/@codevalue"/>
 <xsl:value-of select="book/category"/>
 <xsl:value-of select="jjc:currentDate()"/>
</xsl:template>

function currentDate() {
return Date().toString()
}

<p>When multiple alternative implementations are provided, it is up to
the XSLT processor to determine which to use.</p>

When I compile this using XT I'm getting the following error
file:/C:/Mallik/XSLSamples/booklist.xsl:9: undefined prefix

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