function updateBoard(trieNode) {
  if (trieNode[1]) {
    addEmployeeToDisplay(trieNode[1]);
  }
  for (var i=2; i<=9; i++) {
    memberNode = trieNode[i];
    if (memberNode) {
      updateBoard(memberNode);
    }
  }
  return;
}

Notice that we put the var prefix in front of i=2. In this way we insure i does not share the operations with another i somewhere else.

Learn more about the recursive usage in JavaScript in Column 58, The Doc Dialer.

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