Quote:
if(document.cookie && document.cookie != ""){
var old_cookie = document.cookie;
var new_value = document.form.quantity.value;
var new_cookie = old_cookie + new_cookie;
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A note on the above-- it appears to have new_value as what is in the form, but when adding the old_cookie to new_cookie, in "var new_cookie", it isn't used.
Anyway, as far as adding those digits, you can either multiply each by one, or use the Number function.
var new_cookie = old_cookie * 1 + new_value * 1;
or
var new_cookie = Number(old_cookie) + Number(new_value);
Good luck