Сортировка товаров в тиеде - Tienda

<?php if(TiendaConfig::getInstance()->get('display_sort_by', '1')) :?>
      <form action="<?php echo JRoute::_("&limitstart=".@$state->limitstart )?>" method="post" name="adminForm_sort" enctype="multipart/form-data">        
     	<div class="tienda_sortby" style="margin: 20px 0; text-align:right;">
    	<?php Tienda::load('TiendaSelect', 'libray.select');?>
    	<span class="sort_by_label" style="font-size: 1.15em;">
    	<?php echo JText::_('Sort By');?>
    	</span>
    	<?php echo TiendaSelect::productsortby($state->filter_sortby, 'filter_sortby', array('onchange' => 'document.adminForm_sort.submit();'), 'filter_sortby', true, JText::_('Default Order'));?>
    	<span>
    		<?php 
    			if(strtolower($state->filter_dir) == 'asc')
    			{
    				$dir = 'desc';
    				$img_dir = 'arrow_down.png';
    			}
    			else
    			{
    				$dir = 'asc';
    				$img_dir = 'arrow_up.png';
    			}
    		?>    		
    		<a href="<?php echo JRoute::_("&limitstart=".$state->limitstart."&filter_sortby".$state->filter_sortby."&filter_dir=".$dir);?>">
    			<img src="<?php echo Tienda::getURL('images').$img_dir?>" alt="filter_direction"/>
    		</a>
    	</span>
    	</div>
        <?php echo $this->form['validate']; ?>
    </form>   
    <?php endif;?>