[xsl] Filter by a parameter

["Giancarlo Rossi" <giancarlo_rossi@xxxxxxxxxx>]

I'm using xslt 1.0

<xsl:param name="supplier_param"  />

<xsl:variable name="test">
<xsl:choose>
<xsl:when test="$supplier_param">
<xsl:value-of select="$supplier_param"/>
</xsl:when>
<xsl:otherwise>
*
</xsl:otherwise>
</xsl:choose>
</xsl:variable>


<xsl:for-each select="/Root/Mynode[Complete='true' and
Supplier=$test]/price">

</xsl:for-each>

But it doesnt works...