Hi,

I am trying to extend OWA 2003 to display custom icons for certain message 
classes.
In particular, I am trying to catch non-delivery reports, which may have the 
message class "Report.<original msg class>.NDR", e.g. "Report.IPM.Note.NDR".

If I could use the http://www.w3.org/1999/XSL/Transform namespace I'd be 
able to use "<xsl: when test="contains(m, 'Report') and contains(m, 
'NDR')">", but the OWA 2003 namespace is 
'xmlns:xsl="http://www.w3.org/TR/WD-xsl"', so I am stuck with rolling my own 
Javascript function to do the test.

However, being completely new to XSL, I am having real problems getting the 
syntax right.  My Javascript is contained in the following script block 
which contains other functions that where written by the Exchange OWA team 
that work fine.

    <xsl:element name="xsl:script">
    ...
     function IsReportNDR(szMsgClass)
     {
      szMsgClass = szMsgClass.toUpperCase();
      if ( szMsgClass.indexOf("REPORT") != 0 ) // test for "REPORT" at start 
of string
       return false;

      if ( szMsgClass.indexOf("NDR") == -1 )  // "NDR" anywhere, but 
probably at the end
       return false;

      return true;
     }
    </xsl:element>

I am having difficulty with the syntax in the following choose/when block, 
where the IsReportNDR() is intended to take the value of the XML document 
property <m> which contains the message class value.

The 'when' block that calls IsReportNDR() causes IE to display the error 
"Error: Expression does not return a DOM node." followed by a blank line and 
"<--".  If I comment out the block, the error goes away and the document 
loads OK.
I am clearly breaking some syntax, but I just can't figure it out.

    <xsl:element name="xsl:choose">

...
          <xsl:element name="xsl:when"> 
<!-- This one works fine, so 'm' is good! -->
           <xsl:attribute 
name="test">m[.='IPM.Note.MSP4.Signed.SF']</xsl:attribute>
           <IMG>
            <xsl:attribute 
name="src">/exchweb/img/signed.gif</xsl:attribute>
           </IMG>
          </xsl:element>

        <xsl:element name="xsl:when"> 
<!-- This one doesn't work! -->
            <xsl:attribute name="test">
                <xsl:element name="xsl:eval">IsReportNDR("<xsl:value-of 
select='m' />")</xsl:element>
            </xsl:attribute>
            <IMG>
                <xsl:attribute 
name="src">/exchweb/img/icon-report-ndr.gif</xsl:attribute>
           </IMG>
           </xsl:element>
        </xsl:element>
...
    </xsl:element>

The typical XML input to the above extract is as follows.  I have only 
included the first response block for brevity.

<a:multistatus xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/" 
xmlns:c="xml:" xmlns:a="DAV:">
 <a:contentrange>0-19</a:contentrange>
 <a:response>
  <a:href>http://194.72.164.111/exchange/mike/Inbox/from%20outlook.EML</a:href>
  <a:propstat>
   <a:status>HTTP/1.1 200 OK</a:status>
   <a:prop>
    <p1 b:dt="int">1</p1>
    <p2>/exchweb/img/icon-msg-unread.gif</p2>
    <p4 b:dt="boolean">0</p4>
    <p5>Mike</p5>
    <p6>from outlook</p6>
    <p7 b:dt="dateTime.tz">2004-11-30T17:40:49.349Z</p7>
    <p8 b:dt="int">508</p8>
    <r b:dt="boolean">0</r>
    <m>IPM.Note</m>
   </a:prop>
  </a:propstat>
 </a:response>

Any ideas?
Thanks,
MikeC