Hi Elay,

You can always modify the html structure of the markup.
For example. You can remove the mainnav.php block from the template file (tpls folder)
And change the content of the header.php to something like this.


$sitename = $this->params->get('sitename') ? $this->params->get('sitename') : JFactory::getConfig()->get('sitename');
$slogan = $this->params->get('slogan', '');
$logotype = $this->params->get('logotype', 'text');
$logoimage = $logotype == 'image' ? $this->params->get('logoimage', '') : '';
?>

<!-- MAIN NAVIGATION -->
<nav id="t3-mainnav" class="wrap t3-mainnav navbar-collapse-fixed-top">
<div class="navbar container">
<div class="navbar-inner row-fluid">
<button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<i class="icon-reorder"></i>
</button>

<!-- LOGO -->
<div class="span3">
<div class="logo logo-<?php echo $logotype ?>">
<div class="brand">
<a href="<?php echo JURI::base(true) ?>" title="<?php echo strip_tags($sitename) ?>">
<?php if($logotype == 'image' && $logoimage): ?>
<img class="logoimg" src="<?php echo JURI::base(true) . '/' . $logoimage ?>" alt="<?php echo strip_tags($sitename) ?>" />
<?php endif ?>
<span><?php echo $sitename ?></span>
</a>
<small class="site-slogan hidden-phone"><?php echo $slogan ?></small>
</div>
</div>
</div>
<!-- //LOGO -->

<div class="span9>
<div class="nav-collapse collapse <?php echo $this->getParam('navigation_collapse_showsub', 1) ? 'always-show' : '' ?>">
<?php if ($this->getParam('navigation_type') == 'megamenu') : ?>
<jdoc:include type="megamenu" menutype="<?php echo $this->getParam('mm_type', 'mainmenu') ?>" />
<?php else : ?>
<div class="mainnav-wrap <?php $this->_c('navhelper') ?>">
<jdoc:include type="modules" name="mainnav" style="raw" />
</div>
<?php endif ?>
</div>
</div>
</div>
</div>
</nav>
<!-- //MAIN NAVIGATION -->

Then you need add some css style to make it work.

Regards