FAQ,

> oh. I just realized that Variable value cann't be reset once 
> it is defined.
> 
> So, is there a alternative way where I can do different 
> operation depending on the position of node(element) to be 
> even or odd.

  <xsl:choose>
  <xsl:when test="position() mod 2 = 1">
  ...
  <xsl:when>
  <xsl:otherwise>
  ...
  </xsl:otherwise>
  <xsl:choose>

or if you can't use position, you have to count the preceding nodes yourself.

Cheers,

Jarno