please correct this friend request code

[naru vaishnaw]

i want to show friend request without pressing submit query button. please anyone help me
.change the code without form

<?php
session_start();
mysql_connect("localhost", "root", "");
mysql_select_db("aa");

//START OF LOGIN
if(!isset($_SESSION["logged"])) {
  if(isset($_POST["username"])) {
    $query = mysql_query("SELECT id FROM members WHERE username = '" . $_POST["username"] . "'");
    if(mysql_num_rows($query) > 0) {
      $row = mysql_fetch_array($query);
      $_SESSION["logged"] = $row["id"];
      header("Location: " . $_SERVER["PHP_SELF"]);
    }
  } else {
    echo("<form method=\"POST\">
    <input type=\"text\" name=\"username\" value=\"Type username here\">
    <input type=\"submit\" name=\"submit\">  
    </form>"); 

  }
} else {
//END OF LOGIN

//START OF ADD FRIEND
  if(isset($_GET["add"])) {
    $query = mysql_query("SELECT id FROM members WHERE id = '" . $_GET["add"] . "'");
    if(mysql_num_rows($query) > 0) {
      $_query = mysql_query("SELECT * FROM friend_requests WHERE sender = '" . $_SESSION["logged"] . "' AND recipient = '" . $_GET["add"] . "'");
      if(mysql_num_rows($_query) == 0) {
        mysql_query("INSERT INTO friend_requests SET sender = '" . $_SESSION["logged"] . "', recipient = '" . $_GET["add"] . "'");
      }
    } 
  }
//END OF ADD FRIEND

//START OF ACCEPT FRIEND
  if(isset($_GET["accept"])) {
    $query = mysql_query("SELECT * FROM friend_requests WHERE sender = '" . $_GET["accept"] . "' AND recipient = '" . $_SESSION["logged"] . "'");
    if(mysql_num_rows($query) > 0) {

      $_query = mysql_query("SELECT * FROM members WHERE id = '" . $_GET["accept"] . "'");
      $_row = mysql_fetch_array($_query);

      $friends = unserialize($_row["friends"]);
      $friends[] = $_SESSION["logged"];      

      mysql_query("UPDATE members SET friends = '" . serialize($friends) . "' WHERE id = '" . $_GET["accept"] . "'");

      $_query = mysql_query("SELECT * FROM members WHERE id = '" . $_SESSION["logged"] . "'");
      $_row = mysql_fetch_array($_query);

      $friends = unserialize($_row["friends"]);
      $friends[] = $_GET["accept"];      

      mysql_query("UPDATE members SET friends = '" . serialize($friends) . "' WHERE id = '" . $_SESSION["logged"] . "'");
    }
    mysql_query("DELETE FROM friend_requests WHERE sender = '" . $_GET["accept"] . "' AND recipient = '" . $_SESSION["logged"] . "'");
  }
//END OF ACCEPT FRIEND

//START OF SHOW FRIEND REQUESTS
  $query = mysql_query("SELECT * FROM friend_requests WHERE recipient = '" . $_SESSION["logged"] . "'");
  if(mysql_num_rows($query) > 0) {
    while($row = mysql_fetch_array($query)) { 
      $_query = mysql_query("SELECT * FROM members WHERE id = '" . $row["sender"] . "'");
      while($_row = mysql_fetch_array($_query)) {
        echo $_row["username"] . " wants to be your friend. <a href=\"" . $_SERVER["PHP_SELF"] . "?accept=" . $_row["id"] . "\">Accept?</a><br />";
      }
    }
  }
//END OF SHOW FRIEND REQUESTS

//START OF MEMBERLIST
  echo "<h2>Member List:</h2>";
  $query = mysql_query("SELECT * FROM members WHERE id != '" . $_SESSION["logged"] . "'");
  while($row = mysql_fetch_array($query)) {
    $alreadyFriend = false;
    $friends = unserialize($row["friends"]);
    if(isset($friends[0])) {
      foreach($friends as $friend) {
        if($friend == $_SESSION["logged"]) $alreadyFriend = true;
      }
    }
    echo $row["username"];
    $_query = mysql_query("SELECT * FROM friend_requests WHERE sender = '" . $_SESSION["logged"] . "' AND recipient = '" . $row["id"] . "'");
    if(mysql_num_rows($_query) > 0) {
       echo " - Friendship requested.";
    } elseif($alreadyFriend == false) {
       echo " - <a href=\"" . $_SERVER["PHP_SELF"] . "?add=" . $row["id"] . "\">Add as friend</a>";
    } else {
      echo " - Already friends.";
    }
    echo "<br />";
  }
//END OF MEMBERLIST

//START OF FRIENDLIST
  echo "<h2>Friend List:</h2>";
  $query = mysql_query("SELECT friends FROM members WHERE id = '" . $_SESSION["logged"] . "'");
  while($row = mysql_fetch_array($query)) {
    $friends = unserialize($row["friends"]);

    if(isset($friends[0])) {
      foreach($friends as $friend) {
        $_query = mysql_query("SELECT username FROM members WHERE id = '" . $friend . "'");
        $_row = mysql_fetch_array($_query);
        echo $_row["username"] . "<br />";
      }
    }
  }
//END OF FRIENDLIST
}
?>

Bit confused. You don't have a form, so where's the button come in? You're using links to pass data - which is fine, but that's not what you state in your question.

You're also passing raw ids. Perhaps that's not so wise.