PHP - Need Some Help With A Commerce Problem

Hey everyone. I am making a site for my brother's band and having some trouble with the checkout to paypal. Unfortunately in layout I missed a pretty important variable, the size on shirts. I am trying to add it in as a drop down option just before submitting to paypal but I can't get it to show up on paypal and thus will have no idea what size they are ordering. The site is pretty basic and primitive but I really need this info on the checkout. Here is a link to the temporary site where i'm trying to get this to work:
http://www.theblack44s.com/t/index3.php
and this is what is up and running now:
http://www.theblack44s.com/Merchant%20pages/apparel/index3.php
this is the code i'm working on in cart.php:
Code: [Select]
<?php
require "dbconcart.php";
session_start();

//session_destroy();


$page = 'index.php';


$value2 = $_POST['size'];

//add to cart function
if (isset($_GET['add'])) {
                                        $quantity = mysql_query('SELECT id, quantity, imageurl FROM apparel WHERE id='.mysql_real_escape_string((int)$_GET['add']));
                                        while ($quantity_row = mysql_fetch_assoc($quantity)) {
                                                if ($quantity_row['quantity']!=$_SESSION['cart_'.(int)$_GET['add']]) {
                                                        $_SESSION['cart_'.(int)$_GET['add']]+='1';
}
}
                                          header('Location: '.$page);        
                                        }

//remove from cart
if (isset($_GET['remove'])) {
        $_SESSION['cart_'.(int)$_GET['remove']]--;
        header('Location: '.$page);
}

//delete from cart
if (isset($_GET['delete'])) {
        $_SESSION['cart_'.(int)$_GET['delete']]='0';
        header('Location: '.$page);
                 
}

                  
// products
function products() {
        $get = mysql_query('SELECT id, name, item_number, description, price, shipping FROM apparel WHERE quantity > 0 ORDER BY id DESC');
        if (mysql_num_rows($get)==0) {
                        echo "There are no products to display!";
        }
        else {
                while ($get_row = mysql_fetch_assoc($get)) {
                        echo $get_row['name'].'<br />';
echo $get_row['item_number'].'<br />';
echo $get_row['description'].'<br />';
echo 'Price: '.number_format($get_row['price'], 2).'<br />';
echo 'Shipping: '.number_format($get_row['shipping'], 2);
echo '<a href="cart.php?add='.$get_row['id'].'">Add to cart</a></p>';                                        
                }
        }
        
}


//paypal function
function paypal_items() {
        $num = 0;
        foreach($_SESSION as $name => $value) {
                if ($value!=0) {
                        if (substr($name, 0, 5)=='cart_') {
                                $id = substr($name, 5, strlen($name)-5);
                                $get = mysql_query('SELECT id, name, item_number, price, shipping FROM apparel WHERE id='.mysql_real_escape_string((int)$id));
                                while ($get_row = mysql_fetch_assoc($get)) {
                                        $num++;
                                        echo '<input type="hidden" name="item_number_'.$num.'" value="'.$get_row['item_number'].'">';
                                        echo '<input type="hidden" name="item_name_'.$num.'" value="'.$get_row['name'].'">';
                                        echo '<input type="hidden" name="size_" value="$_POST'.$value2.']">';

echo '<input type="hidden" name="amount_'.$num.'" value="'.$get_row['price'].'">';
                                        echo '<input type="hidden" name="shipping_'.$num.'" value="'.$get_row['shipping'].'">';
                                        echo '<input type="hidden" name="shipping2_'.$num.'" value="'.$get_row['shipping'].'">';
                                        echo '<input type="hidden" name="quantity_'.$num.'" value="'.$value.'">';


                                }
                        }
            
                           }
                           
       }
}



//cart function
function cart() {
        foreach($_SESSION as $name => $value) {
                if ($value>0) {
                  if (substr($name, 0, 5)=='cart_') {
                          $id = substr($name, 5, (strlen($name)-5)); 
                        $get = mysql_query('SELECT id, name, price, imageurl FROM apparel WHERE id='.mysql_real_escape_string((int)$id));
                        while ($get_row = mysql_fetch_assoc($get)) {
                                $sub = $get_row['price']*$value;
                                echo $get_row['name'].' x '.$value.' @ $'.number_format($get_row['price'], 2).' = $'.number_format($sub, 2).'<br />';
?>
<html>
<body>

<form action="size.php"  method="post" name="size">
  <label>Size
  <select name="size">
    <option selected="selected">Select</option>
    <option value="youth">Youth (for the brats)</option>
    <option value="small">Small (petite)</option>
    <option value="medium">Medium (average)</option>
    <option value="large">Large (healthy)</option>
    <option value="xlarge">X Large (large)</option>
    <option value="xxlarge">XX Large (full figured</option>
    <option value="xxxlarge">XXX Large (huge)</option>
    <option value="xxxxlarge">XXXXLarge (DAMN!!)</option>
  </select>
  <input type="hidden" name="size" value="selected" />
  <input type="hidden" name="size" value="submit()" />
  </label>
</form>

</body>
</html>


<?php


echo '<a href="cart.php?remove='.$id.'">[-]</a> <a href="cart.php?add='.$id.'">[+]</a> <a href="cart.php?delete='.$id.'">[delete]</a><br />';             
                                
                                }
                        }
                        $total += $sub;        
                }        
        }
        
        //cart totals and paypal function
        if ($total==0) {
                echo "Your cart is empty.";
        }
        else {
                
                                echo '<p><b>Total: $ '.number_format($total, 2).'</b></p>';
                                ?>
                                <p>
                <form action="https://www.paypal.com/cgi-bin/webscr" target="_blank" method="post">
                <input type="hidden" name="cmd" value="_cart">
                <input type="hidden" name="upload" value="1">
                <input type="hidden" name="business" value="webmaster@theblack44s.com">
                <?php paypal_items(); ?>
                <input type="hidden" name="currency_code" value="USD">
                <input type="hidden" name="amount" value="<?php echo $total; ?>">
<input type="hidden" name="size" value="<?php echo $value2; ?>">
                <input type="image" src="http://www.paypal.com/en_US/i/btn/x-click-but03.gif" target="_blank" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
                </form>
                </p>
               <?php
        }
}

?>