Save value in variable or param?

Hi!

I have a number of if-cases to but different values to a variable that i
want to use later but i can't get i to work. Is it even possible to do
with variable or param? Or maybe some other way?

<xsl:for-each select="root/row">
	<xsl:if test="number &gt;= 200">
		<xsl:if test="number &lt;= 299">
			<xsl:param name="weight" select='"weight2"'/>
		</xsl:if>
	</xsl:if>
	<xsl:if test="number &gt;= 300">
		<xsl:if test="number &lt;= 399">
			<xsl:param name="weight" select='"weight3"'/>
		</xsl:if>
	</xsl:if>
	<xsl:if test="number &gt;= 400">
		<xsl:if test="number &lt;= 499">
			<xsl:param name="weight" select='"weight4"'/>
		</xsl:if>
	</xsl:if>

<li><xsl:attribute name="class"><xsl:value-of
select="$weight"/></xsl:attribute>hej</li>
</xsl:for-each>

Thanks!
/Niklas




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