XPath Question

I need to select MarkNameNodes (with MarkObjectType='TEXT') and its LaserFontNodes, InkFontNodes from a xml document. If a LaserFont or InkFont nodes are not found, display '-".

I have this code :

var MarkNameNodes=theRoot.selectNodes("//MarkTemplate["0"]/MarkingObjects/MarkObject[MarkObjectType='TEXT']/MarkName");
var LaserFontNodes=theRoot.selectNodes("//MarkTemplate["0"]/MarkingObjects/MarkObject[MarkObjectType='TEXT']/LaserFont");
var InkFontNodes=theRoot.selectNodes("//MarkTemplate["0"]/MarkingObjects/MarkObject[MarkObjectType='TEXT']/InkFont");

var strMarkObjectTable="<table border='1' id='MarkObjectGroup'>";
strMarkObjectTable += "<tr><td>MarkName</td><td>Laser</td><td>Ink</td></tr>";

for (i=0;i<MarkNameNodes.length;i++){
      if ( MarkNameNodes.item(i) != null ) {
              strMarkObjectTable += "<tr><td>"+ MarkNameNodes.item(i).text +"</td>";
      } else {
                strMarkObjectTable += "<td>-</td>";
      }

       if (LaserFontNodes.item(i) != null ) {
              strMarkObjectTable += "<tr><td>"+ LaserFontNodes.item(i).text +"</td>";
      } else {
                strMarkObjectTable += "<td>-</td>";
      }

       if ( InkFontNodes.item(i) != null ) {
              strMarkObjectTable += "<tr><td>"+ InkFontNodes.item(i).text +"</td>";
      } else {
                strMarkObjectTable += "<td>-</td>";
      }

       strMarkObjectTable += "</tr>";
}
strMarkObjectTable += "</table><br>";
divMarkObject.innerHTML=strMarkObjectTable;          


it returns me the result of :

MarkName     Laser      Ink
----------------------------------
001               12           12
002               12            9
003               -            -

the correct result should be :  
MarkName     Laser      Ink
----------------------------------
001                -            12
002               12            9
003               12            -

this is the xml :

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfMarkTemplate>
  <MarkTemplate>
    <MarkType>MARKTYPE001</MarkType>
    <ImageId>854</ImageId>
    <MarkingObjects>
      <MarkObject>
        <MarkName>001</MarkName>
        <MarkObjectType>TEXT</MarkObjectType>
        <InkFont>12</InkFont>
      </MarkObject>
      <MarkObject>
        <MarkName>002</MarkName>
        <MarkObjectType>TEXT</MarkObjectType>
        <LaserFont>12</LaserFont>
        <InkFont>9</LaserFont>
       </MarkObject>
      <MarkObject>
        <MarkName>003</MarkName>
        <MarkObjectType>TEXT</MarkObjectType>
        <LaserFont>12</LaserFont>      
      </MarkObject>
      <MarkObject>
        <MarkName>004</MarkName>
        <MarkObjectType>GRAPHIC</MarkObjectType>
        <ObjectText>GRAPHIC001</ObjectText>
         <InkFont>10</InkFont>
      </MarkObject>
    </MarkingObjects>
  </MarkTemplate>
  <MarkTemplate>
   ......
  </MarkTemplate>

</ArrayOfMarkTemplate>

Please advise in what is the right way to code to get the correct result.