Remove separate billing & shipping address?

<?php
/**
 * @package		HikaShop for Joomla!
 * @version		1.6.0
 * @author		hikashop.com
 * @copyright	(C) 2010-2012 HIKARI SOFTWARE. All rights reserved.
 * @license		GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('_JEXEC') or die('Restricted access');
?>
<?php
if($this->identified){
?>
<div <?php
	if($this->has_shipping){
		echo 'id="hikashop_checkout_address" class="hikashop_checkout_address"';
	}else{
		echo 'id="hikashop_checkout_address_billing_only" class="hikashop_checkout_address_billing_only"';
	} ?>>
	<div <?php
		if($this->has_shipping){
			echo 'id="hikashop_checkout_address_left_part" class="hikashop_checkout_address_left_part"';
		}else{
			echo 'id="hikashop_checkout_billing_address" class="hikashop_checkout_billing_address"';
		} ?>>
		<fieldset>
			<legend><?php echo JText::_('HIKASHOP_BILLING_ADDRESS');?></legend>
	<?php
			$this->type = 'billing';
			echo $this->loadTemplate('view');
		if($this->has_shipping){
	?>
		</fieldset>
	</div>
	<div id="hikashop_checkout_address_right_part" class="hikashop_checkout_address_right_part">
		<fieldset>
			<?php
			$checked = '';
			$style = '';
			$override = false;
			if(!empty($this->currentShipping) && method_exists($this->currentShipping, 'getShippingAddress')) {
				$override = $this->currentShipping->getShippingAddress();
			}
			if($override === false) {
				if($this->shipping_address==$this->billing_address){
					$checked = 'checked="checked" ';
					$style = ' style="display:none"';
				}?>
			<div class="hikashop_checkout_shipping_div" id="hikashop_checkout_shipping_div" <?php echo $style;?>>
			<?php
				$this->type = 'shipping';
				echo $this->loadTemplate('view');
			?>
			</div>
<?php 		} else {
?>					<span class="hikashop_checkout_billing_address_info"><?php echo $override;?></span>
<?php			}
		} ?>
		</fieldset>
	</div>
</div>
<div style="clear:both"></div>
<?php
}else{
}