Ajax: Data passing through button value not working

Problem: All the other portions of the program works. When I add data:$("#friendadd").val() it doesn't seem to like that.

Purpose: each user on the website has an add-as-friend button next to it. When you click on that button, I want to put the userid of that user into a database "friends".

Javascript

    <script>
        $(document).ready(function(){
            $("#friendadd").submit(function(){//Used to be .each
                    $.ajax({
                        type:"POST",
                        url:"getuser.php"
                        data:$("#friendadd").val()
                    });//Add data: and success:function
                    //$.post('getuser.php');//JSON AJAX, {UserId:"13", FriendId:"16"}
            })
        });
    </script>

PHP and HTML; $ctk_values are each of the users

    <?php
        for($i=0; $i<$ctk->rowCount(); $i++){
            echo "<img src='".$ctk_values[$i][6]."' alt='Blank' style='width:64px;height:64px'>";//PP, Later add clickable profile
            echo "<th rowspan='3'>Attributes</th>";
            echo "<tr>  ".$ctk_values[$i][0]."</tr>";//UN
            echo "<tr>  ".$ctk_values[$i][1]."</tr>";//UL
            echo "<tr>  ".$ctk_values[$i][5]."</tr>";//UA
    ?>
                <input type="submit" value="<?php echo $ctk_values[$i][4];?>"><br>
    <?php   
        }//Ends for loop
    ?>
            </form>     
    <?php
            }
        }
    ?>

getuser.php

<?php
        if(!isset($_SESSION)){
            session_start();
        }
        require "conn.php";
        $gtu = $dbh->prepare("INSERT INTO friends (AskerId, AcceptorId, mutual, type) VALUES(:AskerId, :AcceptorId, :mutual, :type)");
        $gtu->execute(array(
            'AskerId'=>$_SESSION['UserId'],
            'AcceptorId'=>$_POST['friendadd'],
            'mutual'=>false,
            'type'=>'friend'
            ));
    ?>