jQuery Ajax Banking

<?php

//-----------------------------------
// Mod created by Dave Macaulay ([email protected])
// For free use only with Mccodes V2
// For use of mod this must remain intack!
//------------------------------------

if(!isset($_GET['print'])) {
    require('globals.php');
    echo '<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
    <h3><u>City Bank</u></h3><hr/>';
} else {
    require('globals_nonauth.php');
}
define('price', 5000);
define('file', basename($_SERVER['SCRIPT_FILENAME']));

$_GET['amount'] = (isset($_GET['amount']) && is_numeric($_GET['amount'])) ? abs(intval($_GET['amount'])) : '';
if(isset($_GET['get_bank'])) {
    echo ($_GET['simple'] ? $ir['bankmoney'] : money_formatter($ir['bankmoney'] + 0));
    exit;
}
if(isset($_GET['get_hand'])) {
    echo ($_GET['simple'] ? $ir['money'] : money_formatter($ir['money'] + 0));
    exit;
}
if($ir['bankmoney'] < 0) {
    new_account();
    if(!isset($_GET['print'])) {
        $h->endpage();
    }
    exit;
}
if (!isset($_GET['a']))
{
    $_GET['a'] = '';
}
switch($_GET['a'])
{
    case 'deposit': deposit(); break;
    case 'withdraw': withdraw(); break;
    default: index(); break;
}
function new_account() {
    global $ir,$db,$c,$userid;
    if(!isset($_GET['print'])) {
        ?>
        <script type="text/javascript">
        function openAccount() {
            var c = confirm("Are you sure you want to open a bank account for <?=money_formatter(price)?>?");
            if(c) {
                $('#main_text').html('Opening account...
');
                $('#main_text').append('Checking you have the correct funds...
');
                if(<?=$ir['money']?> < <?=price?>) {
                    $('#main_text').append('<span style="color: red;">Incorrect funds, You need another <?=money_formatter((price)-$ir['money'])?>...</span>');
                } else {
                    $.post('<?=file?>?open=true&print=1', function(data) {
                      if(data == 'not_enough_money') {
                        $('#main_text').append('Incorrect funds...');
                      } else if(data == 'opened') {
                        $('#main_text').append('You have succesfully opened your brand new bank account!<a href="javascript:void(0);">&gt;View Account</a>');
                      }
                    });
                }
            }
        }
        function showBank() {
            $.get('<?=file?>?print=1', function(data) {
                $('#main_text').html(data);
            });
        }
        </script>
        <?php
    }
    if(isset($_GET['open'])) {
        if($ir['money'] < price) {
            echo 'Not enough money to open a bank.';
            exit;
        } else {
            $db->query("UPDATE `users` SET `money` = `money` - " . price . ", `bankmoney` = 0 WHERE `userid` = " . $userid);
            echo 'Bank account opened.';
            exit;
        }
    } else {
        echo '
        <span id="main_text">
        You currently don\'t have a bank account with us, would you like to open an account for only <i>' . money_formatter(price + 0). '</i>!<br/>
     <a href="javascript:void(0);">&gt;Open an account!</a></span>';
    }
}
function index() {
    global $ir,$db,$c,$userid;
    ?>
    <script type="text/javascript">
        function makeTrans(type) {
            if(type != 'withdraw' && type != 'deposit') {
                alert("Script Error!");
            } else {
                var data = $('[name='+type+']');
                $.post('<?=file?>?print=true&a=' + type, { 'amount' : data.val() }, function(data) {
                    $('#' + type + '_callback').html(data);
                    $.post('<?=file?>?print=true&get_bank=true', function(data) { $('#bank_money').html(data); });
                    $.post('<?=file?>?print=true&get_bank=true&sim  ple=true', function(data) { $('[name=withdraw]').val(data); });
                    $.post('<?=file?>?print=true&get_hand=true&sim  ple=true', function(data) { $('[name=deposit]').val(data); });
                });
            }
        }
    </script>
    <?php
    echo 'You currently have <i><span id="bank_money">' . money_formatter($ir['bankmoney'] + 0) . '</i> in your bank account. You are earning 2% interest on this daily.<br/>


    <a href="javascript:void(0);" target="_blank">&gt;Withdraw</a><br/>
    <div id="withdraw" style="background: #ffffd3;border: 1px #ffff99 solid;display: none;padding: 20px;width: 250px;margin: 5px;">
        <form action="" method="post" onsubmit="makeTrans(\'withdraw\');return false;"><input type="text" name="withdraw" value="' . ($ir['bankmoney'] ? $ir['bankmoney'] : 0) . '" /> <input type="submit" value="Withdraw" /></form>
        <div id="withdraw_callback">
            Please select the amount you wish to withdraw then hit the withdraw button next to it.
        </div>
    </div>

    <a href="javascript:void(0);" target="_blank">&gt;Deposit</a><br/>
    <div id="deposit" style="background: #ffffd3;border: 1px #ffff99 solid;display: none;padding: 20px;width: 250px;margin: 5px;">
        <form action ="" method="post" onsubmit="makeTrans(\'deposit\'); return false;"><input type="text" name="deposit" value="' . ($ir['money'] ? $ir['money'] : 0) . '" /> <input type="submit" value="Deposit" /></form>
        <div id="deposit_callback">
           Please choose the amount of money you wish to store in your account.
        </div>
    </div>

    ';
}
function deposit() {
    global $db,$ir,$c,$userid;
    if($_POST['amount'] > $ir['money']) {
        echo '<span style="color:red;">You do not have that much money to deposit!</span>';
    } else {
        $fee = ceil($_POST['amount'] * 15 / 100);
        $fee = ($fee > 3000 ? 3000 : $fee);
        $gain = $_POST['amount'] - $fee;
        $db->query("UPDATE `users` SET `bankmoney` = `bankmoney` + ".$gain.", `money` = `money` - ".$_POST['amount']." WHERE `userid` = ".$userid);
        echo 'You deposited ' . money_formatter($_POST['amount'] + 0) . ' into your account.

        The 15% fee of ' . money_formatter($fee + 0) . ' was taken depositing you a final amount of ' . money_formatter($gain + 0) . '.';
    }
}
function withdraw() {
    global $db,$ir,$c,$userid;
    if(isset($_POST['amount']) && $_POST['money'] > $ir['bankmoney']) {
        echo '<span style="color:red;">You dont have enough money saved to withdraw that much!</span>';
    } else {
        $db->query("UPDATE `users` SET `bankmoney` = `bankmoney` - " . $_POST['amount'] . ", `money` = `money` + " . $_POST['amount'] . " WHERE `userid` = ".$userid);
        $ir['money'] += $_POST['amount'];
        echo 'You withdrew ' . money_formatter($_POST['amount'] + 0) . ' into your hand from your account.<br/>
        You know have ' . money_formatter($ir['money'] + 0) . ' in your hand.';
    }
}
if(!isset($_GET['print'])) {
    $h->endpage();
}
?>