So how do i get variable value from php file with jquery...? the jquery code is in other file (tpl)

Örneğin ben register.php ve register.tpl (register.php için şablon dosyası) var

register.php

 ...some includes here...



if(isset($_POST['submit'])) {
    $username = mysql_real_escape_string(trim($_POST['username']));
    $email = mysql_real_escape_string(trim($_POST['email']));
    $check = $mysql->query("SELECT username FROM ".TBL_USERS." WHERE username = '".$username."' OR email = '".$email."'");
$rows_check = mysql_num_rows($check);
if($rows_check > 0) {
    echo 1;
} else {
    $password = mysql_real_escape_string($_POST['password']);
        $salt = generate_salt($email);
        $hash = hash_password($password, $salt);
        $q = $mysql->query("INSERT INTO ".TBL_USERS." (username, password, email, salt) VALUES ('".$username."', '".$hash."', '".$email."', '".$salt."')");
        if($q) {
            header("Location: index.php");
        } else {
            die(mysql_error());
        }   
    }
} else {
.. calling parse template function ...
}

register.tpl

 ..jquery library included..
    <form id="register" action="register.php" method="post">
       <tr>
       <td>Username</td>
       <td><input type="text" id="username" name="username" class="register" style="width: 200px;" />
    </td>

email ...other inputs... $("#username").blur(function() {

var email_v = $("#email").val();
 $("#msgbox").removeClass().addClass('messagebox').text('Checking...').fadeIn("slow");
 $.post("register.php",{ username:$(this).val(), email: email_v, submit: true } ,function(data)
 {
  if(data=="1") 
  {
   $("#msgbox").fadeTo(200,0.1,function()
   {

    $(this).html('This User name Already exists').addClass('messageboxerror').fadeTo(900,1);
   });
  }
  else
  {
   $("#msgbox").fadeTo(200,0.1,function() 
   {
    $(this).html('Username available to register').addClass('messageboxok').fadeTo(900,1);
   });
  }
 });
});
</script>

when i changed the whole register.php for testing purposes to or the script worked...however with the original version it shows always that username is available...