Urgent: Need help extracting data with JCart shopping cart

I need some help big time with a shopping cart I've built with JCart.  I built the thing over the weekend and was feeling pretty good about it until I was told this morning that we need to collect tax on some of the items in the cart.  My company runs several summer camps for kids and the shopping cart allows the parents to purchase things for them to take to camp.  It also allows parent to put money on a gift card that the kid uses at camp to buy other things.  The things are taxable and the gift card is not.  And therein lies my problem - that and the fact that this has to be done inside of a week.

I really want to make the buying part as easy as possible but can't figure out how to separate the non-taxable item from the others.  I figured that I could subtract the amount of the non-taxable item from the total, figure the tax and add it back in, but I can't even figure out how to access the array the shopping cart is using to begin to start.

I'm attaching the array from a recent test of the cart.  In this instance, I'm looking for the item named 'Trading Post' with a value of 25. It looks like thel product name (trading post) is being assigned the value (25), but I don't understand how to work with this at this time.  Ultimately, this will all need to go into a database but first things first.

I'm sure this isn't as clear as it needs to be as I'm in an almighty hurry, but any help would be greatly appreciated.

object(Jcart)#1 (8) {
  ["config"]=>
  array(12) {
    ["jcartPath"]=>
    string(6) "jcart/"
    ["checkoutPath"]=>
    string(12) "checkout.php"
    ["item"]=>
    array(6) {
      ["id"]=>
      string(10) "my-item-id"
      ["name"]=>
      string(12) "my-item-name"
      ["price"]=>
      string(13) "my-item-price"
      ["qty"]=>
      string(11) "my-item-qty"
      ["url"]=>
      string(11) "my-item-url"
      ["add"]=>
      string(13) "my-add-button"
    }
    ["paypal"]=>
    array(5) {
      ["id"]=>
      string(13) "PGUFPYYKF54EY"
      ["https"]=>
      bool(true)
      ["sandbox"]=>
      bool(false)
      ["returnUrl"]=>
      string(0) ""
      ["notifyUrl"]=>
      string(0) ""
    }
    ["currencyCode"]=>
    string(3) "USD"
    ["csrfToken"]=>
    bool(false)
    ["text"]=>
    array(14) {
      ["cartTitle"]=>
      string(13) "Shopping Cart"
      ["singleItem"]=>
      string(4) "Item"
      ["multipleItems"]=>
      string(5) "Items"
      ["subtotal"]=>
      string(8) "Subtotal"
      ["update"]=>
      string(6) "update"
      ["checkout"]=>
      string(8) "checkout"
      ["checkoutPaypal"]=>
      string(20) "Checkout with PayPal"
      ["removeLink"]=>
      string(6) "remove"
      ["emptyButton"]=>
      string(5) "empty"
      ["emptyMessage"]=>
      string(19) "Your cart is empty!"
      ["itemAdded"]=>
      string(11) "Item added!"
      ["priceError"]=>
      string(21) "Invalid price format!"
      ["quantityError"]=>
      string(38) "Item quantities must be whole numbers!"
      ["checkoutError"]=>
      string(34) "Your order could not be processed!"
    }
    ["button"]=>
    array(4) {
      ["checkout"]=>
      string(0) ""
      ["paypal"]=>
      string(0) ""
      ["update"]=>
      string(0) ""
      ["empty"]=>
      string(0) ""
    }
    ["tooltip"]=>
    bool(true)
    ["decimalQtys"]=>
    bool(false)
    ["decimalPlaces"]=>
    int(1)
    ["priceFormat"]=>
    array(3) {
      ["decimals"]=>
      int(2)
      ["dec_point"]=>
      string(1) "."
      ["thousands_sep"]=>
      string(1) ","
    }
  }
  ["items:private"]=>
  array(4) {
    [0]=>
    string(1) "3"
    [1]=>
    string(3) "sb1"
    [2]=>
    string(3) "ah1"
    [3]=>
    string(11) "tradingPost"
  }
  ["names:private"]=>
  array(4) {
    [3]=>
    string(11) "T-Shirt (L)"
    ["sb1"]=>
    string(11) "Silly Bands"
    ["ah1"]=>
    string(15) "Autograph Horse"
    ["tradingPost"]=>
    string(12) "Trading Post"
  }
  ["prices:private"]=>
  array(4) {
    [3]=>
    string(2) "12"
    ["sb1"]=>
    string(1) "5"
    ["ah1"]=>
    string(2) "13"
    ["tradingPost"]=>
    string(4) "1.00"
  }
  ["qtys:private"]=>
  array(8) {
    [3]=>
    string(1) "1"
    ["sb1"]=>
    string(1) "1"
    ["ah1"]=>
    string(1) "1"
    [4]=>
    string(1) "4"
    [2]=>
    string(1) "4"
    [1]=>
    string(1) "4"
    ["ag1"]=>
    string(1) "1"
    ["tradingPost"]=>
    string(2) "25"
  }
  ["urls:private"]=>
  array(4) {
    [3]=>
    string(0) ""
    ["sb1"]=>
    string(0) ""
    ["ah1"]=>
    string(0) ""
    ["tradingPost"]=>
    string(0) ""
  }
  ["subtotal:private"]=>
  float(55)
  ["itemCount:private"]=>
  int(28)
}

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