Conditional Formating

I need to do some conditional formatting.
I'm a couple apply-templates deep into the tree.  At that point, within the
test of a choose/when, I'd like to reference a attribute of the root of the
tree, or a element off of the root of the tree, or something else that would
be better.

so, my xml might look like this:

<CALENDAR MYFORMAT="WEEK">
 <MYFORMAT>WEEK</MYFORMAT>
 <MONTHS>
  <MONTH>
  </MONTH>
  <MONTH>
  </MONTH>
  ...
 </MONTHS>
</CALENDAR>

I'd like to have some xsl like this but it's not referencing the value of
the MYFORMAT correctly.

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="html"/>

<xsl:template match="*|/"><xsl:apply-templates/></xsl:template>

<xsl:template match="text()|@*"><xsl:value-of select="."/></xsl:template>

<xsl:template match="/">

<xsl:apply-templates/>

<xsl:template match="CALENDAR">
 <xsl:apply-templates select="MONTHS">
 </xsl:apply-templates>
</xsl:template>

<xsl:template match="MONTHS">
 <xsl:apply templates select="MONTH">
 </xsl:apply-templates>
</xsl:template>

<xsl:template match="MONTH">
 <xsl:choose>
  <xsl:when test="MYFORMAT='WEEK'">
   <td>You selected myformat of type week.</td>
  </xsl:when>
 </xsl:choose>
</xsl:template>

Basically, how do I get the xsl:when test=... to work???

Thanks,
Dave

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