discount_price = new Array();
discount_price[0] = new Array(0,300.00,5.00);
discount_price[1] = new Array(1,600.00,7.50);
discount_price[2] = new Array(2,900.00,10.00);
discount_price[3] = new Array(3,1200.00,12.50);
discount_price[4] = new Array(5,1500.00,15.00);