there are two functions for the paypal shopping cart:

1. buy now button, working fine

on (press) {
add ="1";
cmd ="_cart";
business = "MyBusiness@Adomain.com";
item_name ="Animal Clips 512Kbs";
amount = "4.99";
currency_code = "GBP";
getURL("https://www.paypal.com/cgi-bin/webscr","_blank","POST");
}

2. VIEW shopping cart items with an error

on (press) {
cmd ="_cart";
business = "MyBusiness@Adomain.com";
display = 1;
getURL("https://www.paypal.com/cgi-bin/webscr","_blank","POST");
}

viewing the shopping cart items once or several times, every time the script adds 1 more unit to the last "bought now" item automatically.

Unfortunately I`m not experienced enough to find the error myself.
Could someone please help?

thank you