[RESOLVED] How can I solve this Header redirection issues?

Hi,
I need help to figure out what I am doing wrong with header("location: page_to_load"). In local, the redirection works without problems. When I test online on a free server (p4o.net), it works fine; but when I test it on the paid server (mediaserve.com), the redirect loads a blank page.
After the blank page is loaded, I manually load the protected page (MyAccount.php) and all the information were displayed successfuly. I logged out and signed in with wrong credential. The result is a blank page. I manually loaded MyAccount.php again and I had "Access denied". I then concluded that the redirection deos not work. Is there any work arround for this situation? Please help.
Thanks

Login.php

Code:

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<form  id="login" method="POST" action="handlers/login_handler.php">
        <strong>Username</strong>
        <input name="TextBoxEmailAdress" type="text" id="TextBoxEmailAddress" />
        <strong>Password</strong>
        <input name="TextBoxPassword" type="password" id="TextBoxPassword" />
        <input name="ButtonSubmit" value="Login" id="ButtonSubmit" type="submit" />
</form>

---

login_handler.php

Code:

---

<?php
        ob_start();
        //Start session
        session_start();
       
        //Include database connection details
        require_once('../includes/WebConfig.php');
       
        //Array to store validation errors
        $errmsg_arr = array();
       
        //Validation error flag
        $errflag = false;
                       
        //Function to sanitize values received from the form. Prevents SQL injection
        function clean($str) {
                $str = @trim($str);
                if(get_magic_quotes_gpc()) {
                        $str = stripslashes($str);
                }
                return mysql_real_escape_string($str);
        }
       
        //Sanitize the POST values
        $Var_EmailAddress = clean($_POST['TextBoxEmailAddress']);
        $Var_Password1 = clean($_POST['TextBoxPassword']);
       
        //Input Validations
        if($Var_EmailAddress== '') {
                $errmsg_arr[] = 'Login ID missing';
                $errflag = true;
        }
        if($Var_Password1== '') {
                $errmsg_arr[] = 'Password missing';
                $errflag = true;
        }
       
        //If there are input validations, redirect back to the login form
        if($errflag) {
                $_SESSION['ERRMSG_ARR'] = $errmsg_arr;
                session_write_close();
                header("location: ../index.php?PageId=login");
                exit();
        }
       
        //Create query
        $Var_Password1 = md5($Var_Password1);
        $query="SELECT * FROM $tbl_member WHERE EmailAddress='$Var_EmailAddress' AND Password1='$Var_Password1'";
        $result=mysql_query($query);
       
        //Check whether the query was successful or not
        if($result)
        {
                if(mysql_num_rows($result) == 1)
                {
                        //Login Successful
                        session_regenerate_id();
                        $member = mysql_fetch_assoc($result);
                        $_SESSION['SESS_MEMBER_ID'] = $member['Member_Id'];
                        $_SESSION['SESS_FIRST_NAME'] = $member['FirstName'];
                        $_SESSION['SESS_LAST_NAME'] = $member['LastName'];
                        $_SESSION['SESS_EMAIL_ADDRESS'] = $member['EmailAddress'];
                        $_SESSION['SESS_ADMIN_ROLE'] = $member['AdminRole'];
                        $_SESSION['SESS_CONTRIB_EMAIL'] = "";

                        session_write_close();
                        header("location: ../MyAccount.php");
                        exit();
                }
                else
                {
                        //Login failed
                        header("location: ../index.php?PageId=login-failed");
                        exit();
                }
        }
        else
        {
                //echo "mysql error: " .mysql_error();
                //echo "<br> mysql error number: " .mysql_errno();
                //die("Query failed");
                //Login failed
                header("location: ../index.php?PageId=login-failed");
        }
?>

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The problem was solved. There were blank line and space before and after the php tags.
Thanks to everyone.