echo'<li><a href="javascript:void(0);" onClick = "getdetails(id='.$division['id'].')">'.$division['division'].'</a>';

    <script>
        function getdetails(id){
            /*var id = id;
            var rno = $('#rno').val();*/
            $.ajax({
                type: "POST",
                url: "details_tel.php",
                data:{id:id}
            })
        }
    </script>

<?php
include ('class/database.php');
$db_tel = new DatabaseTel();

echo $_POST['id'];
$id = $_POST['id'];

$sql = 'SELECT * from main where id='.$id;
$result = $db_tel->con->query($sql);
$row=mysqli_fetch_array($result);
var_dump($row);
?>