3 in 1 error special tonight

Can anuone see the problem here?

Warning: mysql_real_escape_string() expects parameter 2 to be resource, string given in /home/content/l/h/b/lhbrb/html/sendemail/sendemail.php on line 23

Warning: mysql_real_escape_string() expects parameter 2 to be resource, string given in /home/content/l/h/b/lhbrb/html/sendemail/sendemail.php on line 23

Warning: mysql_real_escape_string() expects parameter 2 to be resource, string given in /home/content/l/h/b/lhbrb/html/sendemail/sendemail.php on line 23
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE yes IN ('instructional', 'tball', '\'rookie\'')' at line 1



$where = '';
if (!empty($_POST['cb']) && count($_POST['cb'])) {
array_walk($_POST['cb'], 'mysql_real_escape_string');
$where = 'WHERE yes IN (\''. implode('\', \'', array_keys($_POST['cb'])).'\')';
}

$query = "SELECT email FROM testemail . $where";
$result=mysql_query($query) or die(mysql_error());


<form action=page.php method=post>

<input type=checkbox name="cb[instructional]">
<input type=checkbox name="cb[tball]">
<input type=checkbox name="cb['rookie']">
<input type=checkbox name="cb['minor']">
<input type=checkbox name="cb['major']">
<input type=checkbox name="cb['prep']">

</form>