Modify attribute based on id

I would like to selectively apply a css class definition to an element 
based on the path. For instance, I have a Research page that I would 
like formatted in two columns rather than one. In this case, then, I 
want to apply/add class="two-column" to the content element <div 
id="content-core">.

I have found leads toward an xsl solution, but have not gotten it to work:

http://docs.plone.org/external/diazo/docs/recipes/adding-an-attribute/index.html

I've modified the given code as follows, but this severely breaks the 
theming:

     <xsl:template match="div#content-core">
         <xsl:copy>
             <xsl:attribute name="class">two-column</xsl:attribute>
             <xsl:copy-of select="@*" />
             <xsl:apply-templates />
         </xsl:copy>
     </xsl:template>

I've also tried variations of the following without success:

     <replace css:content="div#content-core">
         <class="two-column"></class>
     </replace>
     <copy attributes="class" css:content="#content-core" 
if-path="research" theme='//*[@class="two-column"]' />

Thank you,

-- 
Chuck Theobald
System Administrator
The Robert and Beverly Lewis Center for Neuroimaging
University of Oregon
P: 541-346-0343
F: 541-346-0345


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