if ($total_price < 20.00)
            {
            $ship_price = 3.50;
            }
            elseif
            (($total_price >= 20.00) && ($total_price < 50.00))
            {
            $ship_price = 5.50;
            }
            elseif
            (($total_price >= 50.00) && ($total_price < 80.00))
            {
            $ship_price = 10.50;
            }