Internal 500 error ever time post or get Ajax

Every time I try to post or use get from my file index.php which calls Ajax_mysql.php through the Ajax function POST or GET I keep getting a Internal 500 error. The server isnt giving any other error than that. I have included my javascript function that calls the serverside php.

function submit_login() {
    if( document.form.loggedIn.checked ) return
    request = new XMLHttpRequest()
    request.onreadystatechange = respond_login"POST", "Ajax_mysql.php", true)
    request.send( "action=login&password=" + postEscape( document.form.pwd.value ) +
                    "&username=" + postEscape( document.form.user.value ))
    document.form.pwd.value = ""
    document.form.user.value = ""

Php Ajax_mysql.php:

$password_test = "fcb";
$username_test = "ben";
$action = $_POST['action'];
$username = $_POST['username'];
$password = $_POST['password'];
//Testing against hardcoded username and password
if ($username != $username_test)
 //output the response
 $response = "failed"
 echo $response;


 $responce = "failed"   //miss ;
echo $response;       // typo $responce; 

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