How and where to add code to login page

I have a login page which uses the Dreamweaver Login Behavior.  I want to add code to:
     Check the status of the person loging in (status is the last field in the mySQL authentication table).
          a.     If the person is already logged in, display an error message, and reject the attempt.
          b.     If the person is NOT currently logged in, set his status accordingly, and log him in.
Since the behavior is generated code, and well above my head, I don't know what code to enter, and where to enter it.  Here's the code for the form:
<?php require_once('Connections/login.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;   
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  return $theValue;
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
  session_start();
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
  $_SESSION['PrevUrl'] = $_GET['accesscheck'];
if (isset($_POST['username'])) {
  $loginUsername=$_POST['username'];
  $password=$_POST['password'];
  $MM_fldUserAuthorization = "";
  $MM_redirectLoginSuccess = "WOTCPg1.php";
  $MM_redirectLoginFailed = "loginerror.php";
  $MM_redirecttoReferrer = false;
  mysql_select_db($database_login, $login);
  $LoginRS__query=sprintf("SELECT UserID, Password FROM authentication WHERE UserID=%s AND Password=%s",
    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text"));
  $LoginRS = mysql_query($LoginRS__query, $login) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {
     $loginStrGroup = "";
    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;      
    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
    header("Location: " . $MM_redirectLoginSuccess );
  else {
    header("Location: ". $MM_redirectLoginFailed );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
function setFocus()
document.getElementById("username").focus();
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Log-in to IOD</title>
<style type="text/css">
<!--
#apDiv3 {
position:absolute;
left:5px;
top:101px;
width:760px;
height:612px;
z-index:2;
font-family: Arial, Helvetica, sans-serif;
font-size: 14pt;
font-style: normal;
line-height: normal;
font-weight: normal;
font-variant: normal;
text-transform: none;
color: #009;
text-align: center;
background-image: url(images/grid_gray.gif);
border: medium ridge #009;
#apDiv1 {
position:absolute;
left:94px;
top:227px;
width:629px;
height:282px;
z-index:3;
font-family: Arial, Helvetica, sans-serif;
font-size: 14pt;
font-style: normal;
line-height: normal;
font-weight: bold;
font-variant: normal;
text-transform: none;
color: #009;
text-align: center;
#apDiv2 {
position:absolute;
left:178px;
top:248px;
width:564px;
height:254px;
z-index:3;
font-family: Arial, Helvetica, sans-serif;
font-size: 14pt;
font-style: normal;
line-height: normal;
font-weight: bold;
font-variant: normal;
text-transform: none;
color: #009;
text-align: left;
border: medium groove #036;
#apDiv4 {
position:absolute;
left:178px;
top:245px;
width:566px;
height:242px;
z-index:3;
border: medium groove #009;
text-align: center;
font-family: Arial, Helvetica, sans-serif;
font-size: 14pt;
font-style: normal;
line-height: normal;
font-weight: bold;
font-variant: normal;
text-transform: capitalize;
color: #009;
.SubmitButton {
color: #009;
-->
</style>
</head>
<body onLoad="setFocus()" >
<span style="position:absolute; left:3px; top:2px; width:758; height:89;"><img src="sitebuilder/preview/sitebuilder/clipart/bars/regular/horizontal/sleekLines_blue.gif" width="760" height="90" alt="" /></span>
<div id="e2" style="position:absolute; left:13px; top:14px; width:670px; height:32;"><span class="text"><b><span style="font-size: 22px"><font color="#FFFFFF">Sign-in to Information On Demand</font></span><font color="#FFFFFF" size="4"><span style="font-size:22px;line-height:26px;"><br soft="soft" />
</span></font></b></span></div>
<div id="apDiv3">
  <p><span style="text-align: center; text-decoration: underline; color: #009; text-transform: capitalize; font-variant: normal; font-weight: bold; line-height: normal; font-style: normal; font-size: 18pt; font-family: Arial, Helvetica, sans-serif;">Customer Sign-In</span><span style="position:absolute; left:12px; top:23px; width:151px; height:65;"><img src="sitebuilder/images/redInfoOnDemandLogo-150x65.jpg" width="149" height="65" alt="" /></span></p>
</div>
<div id="apDiv4">
<form ACTION="<?php echo $loginFormAction; ?>" id="login" name="login" method="POST">
    <p>     </p>
    <p>User Name:<br /><input name="username" type="text" id="username" tabindex="1" size="30" maxlength="30" />
    </p>
    <p>User's Password:<br />
      <input type="password" name="password" id="password" tabindex="2" />
    </p>
    <p>
      <input name="submit" type="submit" class="SubmitButton" id="submit" tabindex="3" style="color:#009; font-weight:bold" value="Sign-in" />
   <input type="reset" name="reset" id="reset" value="Reset" tabindex="4" style="color:#009; font-weight:bold">
    </p>
  </form>
</div>
<br />
</div>
</body>
</html>
Here's the code for the script "included" in the first line of the page:
<?php
# FileName="Connection_php_mysql.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_login = "localhost";  // Change to "mysql" when uploaded to Yahoo
$database_login = "infoondemand";
$username_login = "root";   // Change to "creacontech" when uploaded to Yahoo
$password_login = "raisin4312";
$login = mysql_pconnect($hostname_login, $username_login, $password_login) or trigger_error(mysql_error(),E_USER_ERROR);
?>
Could someone help me with this?  I'd very much appreciate any assistance.

I should have warned you ealier that I don't know PHP very well, but if I can help nail down the process then hopefully one of the PHP experts can jump in.
I'm still a little fuzzy on what is going on.  If Susie and Rodunda both have their own UserIDs and Passwords, then they can both be logged in at the same time, insert records til their hearts content and there will be abolutely no confict at all. The only issue here that may present a problem is if one of them attameps to update a record while the other one is looking at it, or getting ready to make their own modifications.
Also, if Susie and Rodunda have their own user accounts with their own credentials, how is it that one would try to log in using the others' credentials?
At any rate, and hopefully to get closer to a solutions for you, When a user is successfully authenticated, the session variable MM_Username is created.  So, simpy by checking for the existence of this session variable can tell you if that use is logged in or not.  This check can be placed before any of the login script so that it doesn't interfere with the behavior generated code. And you can choose what to do depending on the condition that exists - such as redirecting immediately to another page, or displaying or hiding a certain region on the page.
Keep in mind that when the page first loads, thel login code is placed in an IF statement that checks the form action, so at first it's ignored and loads the form.  When the form is submitted, the IF conditino is met and the code executes.  To update the database with a "Logged in or out" value, you first have to place a recordset just after the IF statement that checks the form action, wirte another IF statement to check the value of the field, and then redirect to a logout page or continue with the login.
If you continue with the login, you'll need an Update statement to change the field in the database just before the successful redirect.  If you've redirected to a log out page, you'll also need s similar update statement there.
To write the recordset code, you can use DW's wizard and just move the code to where it needs to go. But the DW's update code depend on predeifned recordsets and form actions, so you'll need to find a script or hand code it, I wouldn't recommend trying to use DW's code and then modify it.
So, what do you think, are we getting closer?

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