Passing hidden vars from flash to php

1

I’m placing swfs in product pages of a oscommerce site.
I trying to send the whole info of a certain product to the shopping cart.

ORIGINAL CODE IS:

 
 
<form name="cart_quantity" action="http://www.shop.com/product_info.php&action=add_product" method="post"><input type="hidden" name="products_id" value="26">
    <input type="hidden" name="id[3]" value="9">

The issue is that I need to pass the two hidden vars ( products_id and id[3] - wich is atrributes of the product ( may be size, color or whatever )

I’m making my first test with 50% success.
My flash code is follow:

 
 
boton.onRelease = function(){
 products_id="26";
 id[3]=9;
 getURL("http://www.shop.com/product_info.php?products_id=24&action=add_product", "", "POST");
}
// Possibility two /////////////////////////////
sendVars = new LoadVars();
sendVars.products_id="26";
sendVars.id[3]=9;
boton2.onRelease = function(){
 sendVars.send("http://www.shop.com/product_info.php?products_id=24&action=add_product", "POST");
}

Ok, products_id does pass OK
but id[3] value doesn’t pass.
May be the [3] is the problem, but I can`t change that
i MUST pass the hidden value id[3]
HELP!

UPDATED 2 hours later:

i made a few tests more:

tryed this:
products_id=“26&id[3]=9”;

tryed this:
products_id=“26&id=[,9]”;

tryed this:
products_id=“26&id=(,9)”;

tryed this:
products_id=“26”;
id="[,9]";

BUT NEVER SUCCEDDED