I would like to output all Images except 'base image' and 'small image' for an image Slider. Right now this code below outputs all Images:
<?php
$_product = $this->getProduct();
$_helper = $this->helper('catalog/output');
?>
<?php if ($_product->getImage() != 'no_selection' && $_product->getImage()): ?>
<div class="row slider clearfix">
<div class="column full slide ratio4_3">
<ul class="bxslider product">
<?php foreach ($this->getGalleryImages() as $_image): ?>
<li>
<div class="sliderContent">
</div>
<img src="<?php echo $this->helper('catalog/image')->init($this->getProduct(), 'thumbnail', $_image->getFile()); ?>" class="sliderImage" alt="<?php echo $this->escapeHtml($_image->getLabel()) ?>" />
</li>
<?php endforeach; ?>
</ul>
</div>
</div>
<?php endif; ?>
What is the best way to display all Images not tagged with anything?