Pixellove J1.5 mobile layout menu

hi everyone. I am trying to change the menu for the mobile layouts in Pixellove for J1.5. The helpdesk said it 'beyond their scope', so here I am. How do I change it from the default top or main menu to a new side menu that I have created.
i looked under the template/layout/blocks/nav.php:

<?php if (($this->getParam('menu_enabled', 1) && $gkmenu = $this->loadMenu())) : ?>
<div id="gk-mainnav">

and template/layout/blocks/iphone/menu.php:
<?php if (($gkmenu = $this->loadMenu())) $gkmenu->genMenu (); ?>

but I am not sure what to do

anyone out their have an idea, thanks in advance