<?php

public function getImageUrl($product)
{
    $storeId = Mage::app()->getStore()->getId();
    $sku = Mage::getResourceModel('catalog/product')->getAttributeRawValue($product->geId(), 'sku', $storeId);
    $asin = substr($sku,0,10);

    if ($sku != null) {
        $asin = $product->getAsin();
                     }
        return "http://productimages.bundles.com/images/$asin.jpg";
    }
    else
    {
        return echo error;
    }?>

<?php
  /**
  * @var Bundle_LocalHelpers_Helper_Basic $localHelper
  */
   $localHelper = Mage::helper('localhelper/basic');
   ?>
  <div id="owl-demo" class="owl-carousel">
  <?php

  $categoryId = 2; // this is the category holding your products
   $products = Mage::getSingleton('catalog/category')->load($categoryId) // load the category
           ->getProductCollection() // and the products
           ->addAttributeToSelect('image'); // tell Magento which attributes to get

     foreach ($products as $product) { // iterate through the entire collection
    echo '<div class="item"><img src="'.$localHelper->getImageUrl($product);.'"></div>';  // print the image url inside of the required Owl markup
  }

  ?>
  </div>

   <script>
jQuery.noConflict();
jQuery(document).ready(function() {

  jQuery("#owl-demo").owlCarousel({
    items : 4,
    lazyLoad : true,
    navigation : true
  });

});
</script>