testing for matches

<items>
<item>
 <date>011020<date>
 <stuff>stuff...</stuff>
 <name>jane</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
<item>
 <date>011020<date>
 <stuff>stuff...</stuff>
 <name>alfa</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
<item>
 <date>011020<date>
 <stuff>stuff...</stuff>
 <name>alfa</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
<item>
 <date>011021<date>
 <stuff>stuff...</stuff>
 <name>jane</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
<item>
 <date>011021<date>
 <stuff>stuff...</stuff>
 <name>bata</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
<item>
 <date>011020<date>
 <stuff>stuff...</stuff>
 <name>betta</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
<item>
 <date>011021<date>
 <stuff>stuff...</stuff>
 <name>jane</name>
 <stuff>stuff...</stuff>
  .
  .
</item>
</items>

date               name
-----------------------
011020             jane
same as above      alfa
same as above      same as above
011021             jane
same as above      betta
011020             same as above
011021             jane

that is to have "same as above" where the previouse date/name is the same.
i've been trying something like:

   <xsl:value-of select="date"/><br/>
  </xsl:when>
  <xsl:otherwise>same as above</xsl:otherwise>
 </xsl:choose>
</xsl:template>
and this one for name:
<xsl:template match="item">
 <xsl:choose>
  <xsl:when test="not(preceding::item[position()=last()]/name=name)">
   <xsl:value-of select="date"/><br/>
  </xsl:when>
  <xsl:otherwise>same as above</xsl:otherwise>
 </xsl:choose>
</xsl:template>
but i dont succeed.
whats wrong?
thank you
jian