testing an attribut

Could anybody give me the proper syntax for testing an attribute? Thanks.
The following example will not work with my renderer, what is wrong?

<xsl:template match="Fliesstext.Body">
<xsl:choose>
<xsl:when test='{attribute(Folge)} = 1'>
<TD font-family="Times" font-size="9pt" text-align="justify"
width="{attribute(Einzug)}" >
 <xsl:apply-templates/>
</TD>
</xsl:when>
<xsl:otherwise>
<TD font-family="Times" font-size="9pt" text-align="justify" width="*" >
 <xsl:apply-templates/>
 </TD>
</xsl:otherwise>
</xsl:choose>
</xsl:template>


Franz




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