<!-- Если цена со скидкой - выводим ее -->
<xsl:if test="price_tax != price+discount">
<span class="oldPrice">
<xsl:value-of select="format-number(price+discount, '### ##0,00', 'my')"/><xsl:text> </xsl:text><xsl:value-of select="currency" />
</span>
</xsl:if>