Untitled

jQuery Ajax function does not  complete call
function register(){
$.ajax({
    type: "POST",
    url: "user/registerConfirm.php",
    data:   "regUsername=" + document.getElementById("regUsername").value +
        "&regPassword=" + document.getElementById("regPassword").value +
        "&myPassCheck=" + document.getElementById("myPassCheck").value +
        "&regEmail=" + document.getElementById("regEmail").value,
    dataType: "json",
    success: function(msg){
         alert("Success!");
         alert(msg);
    },
    complete: function(msg){
        alert("Displaying return value now.." + msg);
    },
    error: function(request, status, error) {
        //alert(request.responseText);
        alert("Error, returned: " + request);
        alert("Error, returned: " + status);
        alert("Error, returned: " + error);
    }
});
}

<?php
session_start();
ob_start();

require("../widgets/functions.php");
connectToDB();

// Check email
if (!filter_var(clean($_POST['regEmail']), FILTER_VALIDATE_EMAIL))
{
    $error = 'Invalid email!';
}
else
{
    if ( clean($_POST['regPassword']) == clean($_POST['myPassCheck']) && clean($_POST['regPassword']) != NULL
        &&  clean($_POST['regUsername']) != NULL && clean($_POST['regEmail']) != NULL ) // Register can be allowed
    {
        // Check if their already is a user with the same name..
        $sql="SELECT * FROM `users` WHERE username='".clean(trim($_POST['regUsername']))."'";
        $result=mysql_query($sql);

        // Mysql_num_row is counting table row
        $count=mysql_num_rows($result);

        if($count==1){
        // Their was already a user with this name!
            $error = 'Registration failed - username already taken..';
        }
        else if ( $count == 0 ){
        // Registration allowed, no user found with the same name

            // Encrypt password
            $encryptPass = md5($_POST['regPassword']);

            $subject = "Confirmation registration";
            $message = '
                        <html>
                            <head>
                          <title>Registration at codexplained</title>
                        </head>
                            <body>
                                <p>Hello '.clean($_POST['regUsername']).',</p>

                                <p>Thank you for registering at our website!
                                </p>

                                <p>If you wish, you can now edit your profile, to change your display options and/or to upload your own profile image!<br />
                                We hope to see you commenting on our articles soon!<br />
                                If you wish to receive more information - Please contact us, or message any of our moderators.</p>
                                <hr />
                                <p>- Current moderators - <br />
                                Ruud<br />
                                Willem<br />
                                Quint
                                </p>
                                <hr />
                                </p>
                                - Contact details - <br />
                                Codexplained.tk<br />
                                Codexplained@gmail.com
                                </p>
                            </body>
                        </html>
                        ';
            $from = "Codexplained@admin.com";
            $headers = 'From: Codexplained'."rn";
            $headers  .= 'MIME-Version: 1.0' . "rn";
            $headers .= 'Content-type: text/html; charset=iso-8859-1' . "rn";
            $to = clean($_POST['regEmail']);
            if ( mail($to,$subject,$message,$headers) )
            {
                // Success
            }
            else
            {
                // Failed
            }
            // Insert data
            $query = "INSERT INTO `users`
            (
            `Id` ,`Username` ,`Password` ,`Rank`,`E-mail` ,`PostAmount`, `ProfileImage`, `Ip`, `LastIP`
            )
            VALUES ( NULL , '".clean(trim($_POST['regUsername']))."' , '".$encryptPass."' , 'member', '".clean($_POST['regEmail'])."' , '0', 'none', '".$_SERVER['REMOTE_ADDR']."','".$_SERVER['REMOTE_ADDR']."' )
            ";
            mysql_query($query)or die(mysql_error());

            $error = 'Registration completed!';
        }
    }
    else
    {
        if ( clean($_POST['regPassword']) != clean($_POST['myPassCheck']) )
        {
             $error = 'Passwords do not match...';
        }
        else
        {
            $error = 'Registration failed - not enough data..';
        }
    }
}

echo $error;

//mysql_close();
//header("location:../index.php?page=register");?>

function register(){
$.ajax({
   type: "POST",
   url: "user/registerConfirm.php",
   data:   "regUsername=" + document.getElementById("regUsername").value +
     "&regPassword=" + document.getElementById("regPassword").value +
     "&myPassCheck=" + document.getElementById("myPassCheck").value +
     "&regEmail=" + document.getElementById("regEmail").value,
   dataType: "text", // <-------- There
   success: function(msg){
       alert("Success!");
       alert(msg);
   },
   complete: function(msg){
       alert("Displaying return value now.." + msg);
   },
   error: function(request, status, error) {
       //alert(request.responseText);
       alert("Error, returned: " + request);
       alert("Error, returned: " + status);
       alert("Error, returned: " + error);
   }
 });
}