Ajax Add to Cart question

i have been using following snippet add prodcut variation shopping cart, it's not working quite yet. think it's because not setting selectedoptions properly. values expected selectedoptions parameter?

 

<script>
$(function(){
        var product = {tag_product_json};
 
        var divid = "#catprodtd_"+product.productid;
 
        $(divid).find("input.productsubmitinput").click(function(){
            bcinternals.shop.addtocart(product, {"selectedoptions": [1,4], "skiprefreshafter" : true });
        });
 
 
});
</script>

 

here's link site working on:

http://www.studioofflowers.com/flowers/individual-flowers/dendrobiums

 

you'll see addtocart call get's submitted, ajax response returned is

null; r.error = {"message":"object reference not set instance of object.","type":"system.nullreferenceexception"};/*

any appreciated!

ok, figured out if set selectedoptions [] works, because ajax call picks selected attribute id's anyway.

now need figure out how capture response , update cart display.

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