Доработка фильтра товаров - Общие вопросы и ошибки

<table>
<tr><td valign="top" width="40%">
    <?php if (is_array($characteristic_displayfields) && count($characteristic_displayfields)){?>
        <div class="filter_characteristic">
        <?php foreach($characteristic_displayfields as $ch_id){?>   
            <?php if (is_array($characteristic_fieldvalues[$ch_id])){?>
                <div class="characteristic_name"><?php print $characteristic_fields[$ch_id]->name;?></div>
                <input type="hidden" name="extra_fields[<?php print $ch_id?>][]" value="0" />            
                <?php foreach($characteristic_fieldvalues[$ch_id] as $val_id=>$val_name){?>
                    <input type="checkbox" name="extra_fields[<?php print $ch_id?>][]" value="<?php print $val_id;?>" <?php if (is_array($extra_fields_active[$ch_id]) && in_array($val_id, $extra_fields_active[$ch_id])) print "checked";?> onclick="document.jshop_filters.submit();" /> <?php print $val_name;?><br/>
                <?php }?>
            <br/>
            <?php }?>
        <?php }?>
        </div>
    <?php } ?></td><td valign="top" width="35%">
    <?php if (is_array($filter_manufactures) && count($filter_manufactures)) {?>
    <input type="hidden" name="manufacturers[]" value="0" />
    <span class="box_manufacrurer">
        <?php print JText::_('MANUFACTURER').":"?><br/>
        <?php foreach($filter_manufactures as $v){ ?>
        <input type="checkbox" name="manufacturers[]" value="<?php print $v->id;?>" <?php if (in_array($v->id, $manufacturers)) print "checked";?> onclick="document.jshop_filters.submit();"> <?php print $v->name;?><br/>
        <?php }?>
    </span>
    <?php }?>
    <?php if (is_array($filter_categorys) && count($filter_categorys)) {?>
    <input type="hidden" name="categorys[]" value="0" />
    <span class="box_manufacrurer">
        <?php print JText::_('CATEGORY').":"?><br/>
        <?php foreach($filter_categorys as $v){ ?>
        <input type="checkbox" name="categorys[]" value="<?php print $v->id;?>" <?php if (in_array($v->id, $categorys)) print "checked";?> onclick="document.jshop_filters.submit();"> <?php print $v->name;?><br/>
        <?php }?>
    </span>
    <?php }?>
	<?php if ($show_prices){?>
    <input type="submit" class="button" value="<?php print JText::_('GO')?>">    
    <?php }?>
</form></td></tr></table>