Login Submit - No Page Refresh

Currently my login form resides on it's own page.  I want to change that so it is within a drop down and when user submits it checks to see if valid, if not then return bad username/pass and not refresh the page.

Here is the drop down I've created:
<div id="logindropdown" style="display:none;position:absolute;margin-left:85px;width:222px;height:149px;margin-top:30px;background:url('dashboard/img/loginbox.png') no-repeat;padding:40px 30px 30px 30px;">
            <input type="text" placeholder="Username" name="username" required style="width:127px;padding:5px;">
            <input type="text" placeholder="Password" name="password" required style="width:127px;padding:5px;"><br><br>
            <img src="dashboard/img/signinbtn.png"/>
        </div>

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Here is my current login page:
<?php
  define("_VALID_PHP", true);
  require_once("init.php");
  
  if ($user->logged_in)
      redirect_to("/client/dashboard");
	  
	  
  if (isset($_POST['doLogin']))
      : $result = $user->login($_POST['username'], $_POST['password']);
  
  /* Login Successful */
  if ($result)
      : redirect_to("/client/dashboard");
  endif;
  endif;
?>
<?php include("header.php");?>
<div id="msgholder-alt"><?php print $core->showMsg;?></div>
    <div class="box">
      <form action="" method="post" id="login_form" name="login_form">
        <table width="100%" border="0" cellpadding="3" cellspacing="0" class="display">
          <tr>
            <th width="200"><strong>Username:</strong></th>
            <td><input name="username" type="text" size="45" maxlength="20" class="inputbox" /></td>
          </tr>
          <tr>
            <th><strong>Password:</strong></th>
            <td><input name="password" type="password" size="45" maxlength="20" class="inputbox" /></td>
          </tr>
          <tr>
            <td><input name="submit" value="Login Now" type="submit" class="button"/></td>
          </tr>
        </table>
        <input name="doLogin" type="hidden" value="1" />
      </form>
    </div>

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LVL 12
Nathan RileyFounderAsked:
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Ray PaseurConnect With a Mentor Commented:
What is the question?  If your script is going to redirect the client browser anyway, why would you want to go to the trouble of creating an AJAX request?

The general design of a client login is shown in this article.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_2391-PHP-login-logout-and-easy-access-control.html
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Nathan RileyFounderAuthor Commented:
I want to use my new dropdown to check the login against the login page, if it's correct login as normal if not then have it return bad username/pass.
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Nathan RileyFounderAuthor Commented:
Opening new question, I see it wasn't clear above and can't edit now.
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