declaring global variable in XSL!

hi all,
how can i declare a global variable whose value has to be updated based on
some condition?
for eg:
<xsl:param name="js_var"/><!-- I am passing this variable from javascript-->
<xsl:variable name="var">zero</xsl:variable><!-- assigning default value for
the variable "var" -->
 <xsl:if test="$js_var='1'">
  <xsl:variable name="var">one</xsl:variable>
 </xsl:if>
 <xsl:if test="$js_var='2'">
  <xsl:variable name="var">two</xsl:variable>
 </xsl:if>>
 <xsl:value-of select="$var"/>

the above code is not giving the proper output. can anybody help me to solve
this problem?
thanks in advance.
regards,
syed.



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