function spend_tab_builder(div, selector){
    var ZERO = btoa(array_to_string(integer_to_array(0, 32)));
    var display = document.createElement("div");
    var title = document.createElement("h3");
    title.innerHTML = "Send currency";
    div.appendChild(title);
    div.appendChild(br());
    div.appendChild(display);
    div.appendChild(br());
    var selector_label = document.createElement("span");
    selector_label.innerHTML = "kind to send: ";
    div.appendChild(selector_label);
    div.appendChild(selector);
    div.appendChild(br());
    var amount_text = text_input("how much to send: ", div);
    var max_button = button_maker2("max", calculate_max);
    div.appendChild(amount_text);
    div.appendChild(max_button);
    div.appendChild(br());
    var recipient_text = text_input("who to send to: ", div);
    var button = button_maker2("send", send);
    div.appendChild(br());
    div.appendChild(button);
    div.appendChild(br());

    async function calculate_max(){
        if(selector.value == "veo"){
            var to = parse_address(recipient_text.value);
            spend_tx.max_send_amount(keys.pub(), to, function(m, tx_type){
                amount_text.value = (m / token_units()).toString();
            });
        } else {
            var V = JSON.parse(selector.value);
            var cid = V[0];
            var type = parseInt(V[1]);
            var trie_key = sub_accounts.key(keys.pub(), cid, type);
            var trie_key = btoa(array_to_string(trie_key));
            var x = await merkle.arequest_proof("sub_accounts", trie_key);
            amount_text.value = write_veo(x[1]);
        };
    };
    async function send(){
        var to = parse_address(recipient_text.value);
        var from = keys.pub();
        var amount = Math.round(parseFloat(amount_text.value, 10)* token_units());
        if(selector.value == "veo"){
            var tx = await spend_tx.amake_tx(to, from, amount);
            var stx = keys.sign(tx);
            var msg = await apost_txs([stx]);
            display.innerHTML = msg;
        } else {
            var ma = await rpc.apost(["account", keys.pub()]);
            var V = JSON.parse(selector.value);
            var cid = V[0];
            var type = parseInt(V[1]);
            var sk = sub_accounts.key(keys.pub(), cid, type);
            var sk = btoa(array_to_string(sk));
            var balances_db = tabs.balances_db;
            console.log(sk);
            console.log(balances_db);
            if(balances_db[sk] &&
               balances_db[sk].limit){
                amount = Math.floor(
                    amount /
                        balances_db[sk].limit);
            };
            var Nonce = ma[2] + 1;
            var fee = 152050;
            var tx = ["sub_spend_tx",
                      keys.pub(),
                      Nonce,
                      fee, to, amount,
                      cid, type];
            var stx = keys.sign(tx);
            var msg = await apost_txs([stx]);
            display.innerHTML = msg;
        };
    };
};