/**
  * @see Mage_Checkout_Block_Multishipping_Overview::renderTotals()
  * Overriding this method in order to adjust the row span for the total columns.
  *
  * @param  mixed
  * @param  int | null
  * @return string
  */
 public function renderTotals($totals, $colspan = null)
 {
     if ($colspan === null) {
         $colspan = $this->helper('tax')->displayCartBothPrices() ? 6 : 4;
     }
     return parent::renderTotals($totals, $colspan);
 }