Dom scripting insertBefore error

Hello,

I have made a function that updates the page after the ajax is ready... the function will insert images in a table. There error i get in firefox is:

Node was not found" code: "8
          table.insertBefore(newRow, tbodyKids[b]);

it works if i simply use table.appendChild(); but not if i use table.insertBefore().


here is my function: (Please see the comments near the bottom of the code)

function updatePage() {
      if (request.readyState == 4) {
            if (request.status == 200) {
            var table = document.getElementById("acctable");
            var tableKids = table.childNodes;
            for (var a=0;a<tableKids.length;a++) {
                  if (tableKids[a].nodeName == 'TBODY') {
                        var tbody = tableKids[a];
                        var tbodyKids = tbody.getElementsByTagName("tr");
                        for (var b=0;b<tbodyKids.length;b++) {
                              if(tbodyKids[b].className != "mheader") {
                                    var rowCells = tbodyKids[b].getElementsByTagName("td")[1];
                                    var text = rowCells.innerHTML;
                                    // this regular expression will only return the numbers
                                    var re = /[0-9]{3,6}/g;
                                    // run the expression on our text string
                                    var result = text.match(re);
                                    // result.match(/(\d+)/);
                                    var xmlDoc = request.responseXML;
                                    var accomId = xmlDoc.getElementsByTagName("TOUROPERATORCODE");
                                    for (i=0;i<accomId.length;i++) {
                                          var theNode = accomId[i];
                                          var theNumber = theNode.firstChild;
                                          var numberVal = theNumber.nodeValue;
                                                if (result == numberVal) {
                                                      var accomParent = accomId[i].parentNode;
                                                      var accomidKids = accomParent.childNodes;
                                                      for (d=0;d<accomidKids.length;d++) {
                                                            if (accomidKids[d].nodeName == 'ACCOMTHUMB') {
                                                                  var accomThumbKids = accomidKids[d].childNodes;
                                                                  for (e=0;e<accomThumbKids.length;e++) {
                                                                        if (accomThumbKids[e].nodeName == 'IMAGEURL') {
                                                                              var accomthumbSrc = accomThumbKids[e].firstChild;
                                                                              var accomthumbSrcVal = accomthumbSrc.nodeValue;
                                                                              var newRow = document.createElement("tr");
                                                                                table.appendChild(newRow);                        // this works fine
                                                                              table.insertBefore(newRow, tbodyKids[b]);  // this gives the error
                                                                              var nextThumb = document.createElement("img");
                                                                              nextThumb.setAttribute("src", accomthumbSrcVal);
                                                                              newRow.appendChild(nextThumb);
                                                                        }
                                                                  }
                                                            }
                                                      }
                                                }
                                          }
                                    }
                              }
                        }
                  }
            } else alert("Error! Request status is " + request.status);
      }
}


Thanks
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