may be I didn't explain correctly what I was looking for:
I needed to sort it out like this:
<!-- applet -->
<xsl:stylesheet
version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl
utput method='html' indent='yes'
doctype-public='-//W3C//DTC HTML 4.0 Final//EN'/>
<xsl:template match='applet'>
<h3 align="left" style="text-align:left"><u>Suivi graphique des appels:</u></h3>
<p>
<blockquote>
<APPLET>
<xsl:attribute name="code"><xsl:value-of select='@code'/></xsl:attribute>
<xsl:attribute name="codebase"><xsl:value-of select='@codebase'/></xsl:attribute>
<xsl:attribute name="archive"><xsl:value-of select='@archive'/></xsl:attribute>
<xsl:attribute name="width"><xsl:value-of select='@width'/></xsl:attribute>
<xsl:attribute name="height"><xsl:value-of select='@height'/></xsl:attribute>
<br/>
<xsl:for-each select="param">
<PARAM>
<xsl:attribute name="NAME">
<xsl:value-of select='@name'/>
</xsl:attribute>
<xsl:attribute name="VALUE">
<xsl:value-of select='@value'/>
</xsl:attribute>
<br/>
</PARAM>
</xsl:for-each>
</APPLET>
</blockquote>
</p>
</xsl:template>