remove if value-of = 0 how?

[sushestvo]

I have:
<xsl:for-each select="/DATA/REPORT/ITEM">
<td class="fakeGridHeader" align="center">
<b><xsl:value-of select="FirstName"/>*<xsl:value-of select="LastName"/></b></td>
</xsl:for-each>
Some of the FirstName or lastname could be 0 in XML. if so, how can i make it to choose only values that are not 0?

[KC-Luck]

<xsl:if test="string-length(FirstName) > 0 and string(FirstName) != '0'">
<xsl:value-of select="FirstName"/>
</xsl:if>