global variables and more

Hi,

I want to adjust the layout of my page (potrait or landscape), depending on 
how many entries I got in my xml.
If there are 5 or less entries potrait, 5+ entries landscape.

So I try to check first and create some global-variables and put in some 
values for the layout (page height, ...)

This approach doesn't work of course:
<xsl:choose>
 <xsl:when test="count(/ColumnNames/Column) &lt;= 5">
   <xsl:variable name="page-height">29.7cm</xsl:variable>
   <xsl:variable  name="page-width">21cm</xsl:variable>
   ...
 </xsl:when>
 <xsl:otherwise>
   <xsl:variable name="page-height">21cm</xsl:variable>
   <xsl:variable name="page-width">29.7cm</xsl:variable>
   ...
 </xsl:otherwise>
</xsl:choose>

But is there a way to do something like that?
I don't want to check a million times in my xsl (I have a lot of attributes 
depending on the kind of layout).
Thanks
Jonny

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