xsl:attribute

I am having a problem with...
<xsl:choose>
	<xsl:when test="...">
		<xsl:for-each select="PERSON">
     			<a><xsl:attribute name="href">adsasd</xsl:attribute><xsl:value-of
select="position()"/> - 					<xsl:value-of select="NAME"/></a><br/>
	      </xsl:for-each>
	</xsl:when>
	<xsl:otherwise>
		<xsl:attribute name="href"><xsl:value-of
select="$folder"/></xsl:attribute>
	</xsl:otherwise>
......


The problem is that the if the attribute is set in the first part (ie when
condition is true) and then the <xsl:otherwise> is true the new value of
href is the original one + the new one (ie the values are appended to each
other) how do I avoid that. Can i reset the value for attribute?



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