Displaying category levels in navigation

Hi Guys,

I'm pretty close, but just can't get the last of this working... can you help?

I've trying to display 1st level navigation in the #mainNav, and 2nd Level Navigation in the #sideNav, which is generally working fine - however if I select at iten in the #mainNav that has children, it displays the children in the #mainNav as well as in the #sideNav.

Refer: http://freestylepools.com.au/web2013/index.php

  // load detail record from 'navigation'
  list($navigationRecords, $navigationMetaData) = getRecords(array(
    'tableName'   => 'navigation',
    'where'       => whereRecordNumberInUrl(1), // If no record # is specified then latest record is shown
    'loadUploads' => true,
    'allowSearch' => false,
    'limit'       => '1',
  ));
  $detailRecord = @$navigationRecords[0]; // get first record
  if (!$detailRecord) { dieWith404("Record not found!"); } // show error message if no record found

  // load level 1 menu (note: program calls this depth and starts counting at 0)
  $SELECTED_MENU_NUM = coalesce(@$SELECTED_MENU_NUM, getLastNumberInUrl());
  list($level1MenuRecords, $selectedMenuRecord) = getCategories(array(
    'tableName'             => 'navigation',           // REQUIRED
    //'rootCategoryNum'       => '0',                 // Only categories _below_ this one will be shown (defaults to 0 for all)
    'defaultCategory'       => '',               // Enter 'first', a category number, or leave blank '' for none
    'selectedCategoryNum'   => $SELECTED_MENU_NUM,    // defaults to getLastNumberInUrl()
    'categoryFormat'        => 'onelevel',            // showall, onelevel, twolevel, breadcrumb
  ));
  if (!$SELECTED_MENU_NUM) { $SELECTED_MENU_NUM = $selectedMenuRecord['num']; }

  // load level 2-3 menu
  $level2MenuRecords = array();
  if ($selectedMenuRecord) {
    list(,$rootNumSelected) = explode(":", $selectedMenuRecord['lineage']); // lineage shows parent nums, eg, 3rd level record 33 might show. :1:12:33:
    list($level2MenuRecords,) = getCategories(array(
      'tableName'             => 'navigation',          // REQUIRED
      'rootCategoryNum'       => $rootNumSelected,      // Only categories _below_ this one will be shown (defaults to 0 for all)
      //'defaultCategory'       => 'first',             // Enter 'first', a category number, or leave blank '' for none
      //'selectedCategoryNum'   => '',                  // defaults to getLastNumberInUrl()
      'categoryFormat'        => 'onelevel',           // showall, onelevel, twolevel, breadcrumb
    ));
  }

I've got the following;

<ul id="sideNav">
<?php foreach ($level2MenuRecords as $listRecord): ?>
  <?php $isSelected = ($listRecord['num'] == $detailRecord['num']); ?>
              <li><a href="<?php echo htmlencode($listRecord['_link']) ?>" class="<?php if ($isSelected) { print "current"; } ?>" ><?php echo htmlencode($listRecord['title']) ?></a></li>
<?php endforeach ?>
 </ul>

<nav class="row">
    <ul id="mainNav" class="content">
    <?php foreach ($level1MenuRecords as $listRecord): ?>
      <?php $isSelected = ($listRecord['num'] == $detailRecord['num']); ?>
      <li><a href="<?php echo htmlencode($listRecord['_link']) ?>" class="<?php if ($isSelected) { print "current"; } ?>"><?php echo htmlencode($listRecord['title']) ?></a></li>
    <?php endforeach ?>

    </ul>
</nav>