I am trying to use selectNodes in a javascript function to select a sub set 
of XML data. Below is a sample of the XML Data.
I have tried many different types of syntax to get it to work, but without 
any success.  I believe that I am not 
specify my select criteria correctly. The latest error I am getting is as 
follows:

	Error: Expression does not return a DOM node

-->"headerDISCREPTABTYP[./DISCREPTABTYP/discrepancytype!value()
    =BELONG$and$ ./DISCREPTABTYP/empcode!value()=114351]"<--

The selection criteria I am trying to use is to select nodes who have child 
nodes that are CDATA nodes with given values.  In this case I want to select 
all DISCREPTABTYP nodes that have discrepancytype = BELONG and empcode = 
114351.

What I am asking then is what is correct syntax for selctNodes to get the 
records I want.

This is an example of what XML data looks likes:
 <?xml version="1.0" ?> 
 <headerDISCREPTABTYP xmlns:dt="urn:schemas-microsoft-com:datatypes">
   <DISCREPTABTYP heading="UNKNOWN" description="UNKNOWN EMPLOYEES IN UNIT" >
     <discrepancytype> <![CDATA[ UNKNOWN  ]]>  </discrepancytype>
     <empcode> <![CDATA[ 62009  ]]>  </empcode>
     <startscan> <![CDATA[ 02/10/2006 09:24:16 am  ]]>   </startscan>
   </DISCREPTABTYP>
   <DISCREPTABTYP heading="BELONG" description="EMPLOYEES WHO BELONG AND ARE 
WORKING IN UNIT" >
     <discrepancytype> <![CDATA[ BELONG  ]]>   </discrepancytype>
     <empcode> <![CDATA[ 114351  ]]>   </empcode>
     <startscan> <![CDATA[ 02/06/2006 08:56:01 am  ]]>  </startscan>
  </DISCREPTABTYP>
  <DISCREPTABTYP heading="BELONG" description="EMPLOYEES WHO BELONG AND ARE 
WORKING IN UNIT" >
    <discrepancytype> <![CDATA[ BELONG  ]]> 
    </discrepancytype>
    <empcode> <![CDATA[ 114351  ]]>   </empcode>
    <startscan> <![CDATA[ 02/07/2006 08:34:21 am  ]]>  </startscan>
  </DISCREPTABTYP>
  <DISCREPTABTYP heading="BELONG" description="EMPLOYEES WHO BELONG AND ARE 
WORKING IN UNIT" >
    <discrepancytype> <![CDATA[ BELONG  ]]>  </discrepancytype>
    <empcode> <![CDATA[ 189191  ]]>  </empcode>
    <startscan> <![CDATA[   ]]>  </startscan>
  </DISCREPTABTYP>
   <DISCREPTABTYP heading="FLOATOUT" description="EMPLOYEES FLOAT OUT OF 
UNIT" >
     <discrepancytype> <![CDATA[ FLOATOUT  ]]>  </discrepancytype>
     <empcode> <![CDATA[ 114351  ]]>  </empcode>
     <startscan> <![CDATA[ 02/10/2006 09:24:16 am  ]]>   </startscan>
   </DISCREPTABTYP>
 </headerDISCREPTABTYP>

Below is an excerpt from my javascript function that calls selectNodes:  
DataSource1 is the XML data file defined elsewhere

function EmployeeAsScanned(discreptype,empcode)
{

var nodePtr;
       nodePtr = DataSource1.selectNodes 
('"headerDISCREPTABTYP[./DISCREPTABTYP/discrepancytype!value()=' + 
discreptype + "$and$./DISCREPTABTYP/empcode!value()=" + empcode + ']"');

//        nodePtr = DataSource1.selectNodes 
('"/headerDISCREPTABTYP/DISCREPTABTYP[discrepancytype!value()=' + discreptype 
+ "$and$empcode!value()=" + empcode + ']"');

//        nodePtr = DataSource1.documentElement.selectNodes 
('"headerDISCREPTABTYP[./DISCREPTABTYP/discrepancytype!value()=' + 
discreptype + "$and$./DISCREPTABTYP/empcode!value()=" + empcode + ']"');
}