<div class="ordered_block">
    <bx_text:_categ_order_order_by />
    <select onchange="loadDynamicBlock(__block_id__, '__page_url__&orderby=' + this.value)">
        <bx_repeat:options>
            <option value="__key__" <bx_if:show_selected>selected="selected"</bx_if:show_selected>>__value__</option>
        </bx_repeat:options>
    </select>
</div>
<div class="clear_both"></div>