[Sisom]

I've tried this in 4.1.0 and the code in skin1/main/history_order.tpl needs a little changing:

After
{include file="buttons/button.tpl" button_title=$lng.lbl_print_invoice target="_blank" href="order.php?orderid=`$order.orderid`&mode=invo ice"}

I needed to put

<td class="ButtonsRow">

{include file="buttons/button.tpl" button_title="Print Packing Slip"
target="_blank"
href="order.php?orderid=`$order.orderid`&mode=pack ing"}

Putting <td class="ButtonsRow"> instead of <br>