javascript innerHTML not changeing because php session -

i start work session in php , mysql have login page check if user exists inside mysql , if true session_start() , session equal user login

and have redirect page in page there session_start() , if statement check if there session exists , if true try change <li> inside <ul>

document.getelementbyid('id').innerhtml = 'string';  

and not work me if try doing else alert('string') work me

php file #1:

$query = "select * website_users user_name='$checked_user_name' , password='$checked_password';";  $results = mysqli_query($connect_db , $query);  if (mysqli_num_rows($results) > 0) {     echo "<script>document.getelementbyid('done').innerhtml = 'log in successful'</script>";      $_session['session_name'] = $checked_user_name;      header("refresh:2; url=http://10.0.0.14/itzik_website/xss.php"); } else {      echo "<script>document.getelementbyid('done').innerhtml = 'ops user name or password not vaild'</script>"; } 

php file #2:

session_start();  if(!isset($_session['session_name'])) {    // todo } else {       echo "<script>document.getelementbyid('id').innerhtml = 'string';</script>"; } 

if know problem answer question please