Create a new bookmark under an existing bookmark in the tree

Question

I have a script to search through a time sheet report for the pages without the string "Employee Signature" and to then create new bookmarks under the existing bookmarks in the tree.
So far the script will execute the book marks for the pages in the time sheet report without the string "Employee Signature".
At the last bookmark executed it will insert a new child bookmark before the following console error appears.
this.bookmarkRoot.children[(m + 1)] is undefined
19:Console:Exec
TypeError: this.bookmarkRoot.children[(m + 1)] is undefined
19:Console:Exec
of 128
If someone can please advise where the script is going wrong it will be very much appreciated.  The script is as follows:
var ckWords; // word pair to test
var bFound = false; // logical status of found words
// loop through pages
for (var m = 0; m < this.numPages; m++ ) {
   bFound = false; // set found flag to false
   numWords = this.getPageNumWords(m); // number of words on page
   // loop through the words on page
   for (var j = 0; j < numWords-1; j++) {
      // get word pair to test
      ckWords = this.getPageNthWord(m, j) + ' ' + this.getPageNthWord(m, j + 1); // test words
      // check to see if word pair is 'Employee Signature' string is present
      if ( ckWords == "Employee Signature") {
         bFound = true; // indicate found logical value
         break; // no need to further test for this page
      } // end Employee Signature
   } // end word loop
   // test to see if words not found
   if(bFound == false) {
        var nLastSub = this.bookmarkRoot.children[(m+1)].children.length-1;
        this.bookmarkRoot.children[m+1].children[nLastSub].execute();
this.bookmarkRoot.children[m+1].children[nLastSub].createChild("Employee Signature Reqd", "this.pageNum = " + (m+1));
    } // end not found on page  
} // end page loop
Thank you

Answer 1

I need to place a new bookmark underneath the existing bookmarks for the pages that do not contain the words "employee signature".
I am not sure how to refer to the existing bookmark on those pages.
Tried to revise the script, and now all of the new bookmarks are created underneath all of the existing bookmarks for every page in a continuous loop.
I need a new single bookmark underneath the exisiting bookmarks on the pages that do not contain the words "employee signature".
Can you please help?
var ckWords; // word pair to test
var bFound = false; // logical status of found words
// loop through pages
for (var m = 0; m < this.numPages; m++ ) {
   bFound = false; // set found flag to false
   numWords = this.getPageNumWords(m); // number of words on page
   // loop through the words on page
   for (var j = 0; j < numWords-1; j++) {
      // get word pair to test
      ckWords = this.getPageNthWord(m, j) + ' ' + this.getPageNthWord(m, j + 1); // test words
      // check to see if word pair is 'Employee Signature' string is present
      if ( ckWords == "Employee Signature") {
         bFound = true; // indicate found logical value
         break; // no need to further test for this page
      } // end Employee Signature
   } // end word loop
   // test to see if words not found
   if(bFound == false) {
for (var i=0; i < this.bookmarkRoot.children.length; i++)
        var nLastSub = this.bookmarkRoot.children[i].children.length-1;
        this.bookmarkRoot.children[i].children[nLastSub].execute();
this.bookmarkRoot.children[i].children[nLastSub].createChild("Next Page", "this.pageNum = " + (m+1));
    } // end not found on page  
} // end page loop