[xsl] xsl:variable with hex color values

[Rolando Isidoro <rli@xxxxxxxxxx>]

Hi, I'm trying implementing a XSL which distinguishes odd and even row 
of a table by using different colors. My solution involves the testing 
of the number or the position, something like this:

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

the existing code inside each of the <td>'s differs only in the 
background color, which resolves into big time redundancy. Is there any 
way to assign the color value to a variable and then using it in the 
bgcolor attribute? I've tried using something like <xsl:variable 
name="bg" select="Black"> and then <td bgcolor = "$bg"> but it doesn't 
seem to work. I've tried with hex color values, which is my objective, 
and it didn't work either.

Thanks, Rolando