line 65 ( ! ) Parse error: syntax error, unexpected '"' in

	<?php
 session_start();
 if($_SESSION['login'] != "That GRRRRREAT")

 {
	 header('Location: login.php');
	 exit();
 }

?>

<!DOCTYPE html>
	<html>
				<head>
    <link rel="stylesheet" type="text/css" href="main.css">
		<script src="main.js"></script>
		<script src="jquery-3.3.1.js"></script>
	 </head>

<body>
	<div id = "newcontact">
  <p class= "header"> New Messafe</p>
		<p class= "body">
		 <form align= "center" method="post">
		 <input type="text" class = "minput" id ="user" placeholder = "user" name="user" onkeyup="checknames()"/>
     <datalist id = "users"></datalist>
		  <br>
		 <textarea   class = "minput" name="nmess" placeholder="write the message"></textarea><br><br>
	   <?php  require_once 'message.php';

		 ?>

		 <input type="submit" name="send" value="send"/>
		  <input type="submit"  class = "cancel" onclick="cancel()"name="cancel" value="cancel"/>
	 </form>
</p>
	<p class= "footer">click to Send</p>

	</div>
	<div id="container">
    <div id ="meni">
			<?php echo $_SESSION['username']; ?>
		</div>
		<div id= "leftside">

		<div id="left-col-container">

     <div onclick="display()" class = "mess"> <p class="nMess"> New message</p> </div>
			<div class="greyback"> <img src="place.jpg" class="image"> daddy</div>

				</div>

		</div>
		<div id= "rightside">
				<div id="right-col-container">
      	<div id="mainmessages">

   <?php
	 $db = mysqli_connect("localhost", "root", "root", "c9") or die("QUERY failed". mysqli_error($db));
    $query = 'SELECT * FROM `messages`
		 `sender` = "'.$_SESION['Username'].'"
		 AND `reciver`= '.$_GET['user']. '
		 OR
		 `sender` = '".$_GET['user'].'"
		AND `reciver`= "'.$_SESION['Username'].'";
    $r = mysqli_query($db,$query);
if($r)
{
	//works
	while($row = mysqli_fetch_assoc($r))
	{

		        $sender = $_SESSION['sender'];
		        //use user as username is a cookie.
		        $reciver = $_POST['reciver'];
		        $message = $_POST['message_text'];
						if($sender == $_SESION['Username'])
						{
							?>
							<div class ="greym">
								<a href='#'>			<?php echo $_SESSION['username']; ?></a>
							<p>	<?php echo $message ?></p>
						</div>
						<?php
						}else {
							//show the message the other person wrote.
							?>
							<div class="whiteb">
													<a href='#'>
													<?php
													echo $sender_name;
													?>
													</a>
								<p><?php echo $message ?></p>
							</div>
						<?php }
	}
}
else
{
	//query issues
	echo $q
}
	  ?>


				<textarea class="textarea" placeholder= "Message">
				</textarea>
		</div>

	</div>
</body>
</html>