-----Original Message-----
From: Tuan Luu [mailto:tuanluu(_at_)gmx(_dot_)ch]
somehow I  did find a solution:
Hi,
Well, to add a few pointers :
<xsl:template match="monat">
        <xsl:if test= "numeric(.) < 100.00">
This should be number() instead of numeric(), but this you already
discovered..
            <xsl:variable name="farbe">#00ff00</xsl:variable>
        </xsl:if>
    <td bgcolor="$farbe" align="right">
Then this here should become:
<td bgcolor="{$farbe}" align="right">
Notice the curly braces {} to force the processor to interpret '$farbe' as a
variable name, or more generally as an XPath expression.
Somehow, I would consider putting a color-map somewhere in the source XML,
the stylesheet or a separate XML, like:
<colormap>
  <color min="0" color="#ff9600" />
  <color min="98.70" color="#ff0000" />
  <color min="100" color="#00ff00" />
</colormap>
Then you could avoid all the xsl:choose / xsl:if logic by merely fetching
the color value corresponding to the number value in question, like
<xsl:template match="monat">
  <td bgcolor="{/colormap/color[(_at_)min >= number(current())][1]/@color}"
      align="right">
...
So, fetch the color attribute from the first color node whose min value is
greater than or equal to the current value.
Hope this helps!
Cheers,
Andreas