Custom Login

So I'm playing with using like a top reveal for a login to the admin area. Basically it just slides down when activated from a login link or button. This is how I have the form setup but I know I probably need to <php? include> some other things maybe even view functions or something??

Right now when I click the sign in button it just takes me to the stock login page... basically I wanna bypass that stock page and just go straight to the admin... Can anyone help? Thanks

<!-- Top reveal (slides open, add class "topReveal" to links for open/close toggle ) -->
<div id="ContentPanel">

<!-- close button -->
<a href="#" class="topReveal closeBtn">Close</a>

<div class="contentArea">

<!-- Alternate Login -->
<div>

<form class="loginForm" method="post" action="admin?" style="height:auto;">
<input type="hidden" name="action" value="loginSubmit" />

<div id="loginBg"><img src="images/blank.gif" width="148" height="110" alt="" /></div>
<h2 style="margin-top: 50px;"></h2>
<fieldset>
<legend>Account Login</legend>
<p class="left" style="margin: 0 8px 0 0;">
<label for="RevealUsername" class="overlabel">Username</label>
<input id="RevealUsername" name="username" type="username" class="loginInput textInput rounded" value="<?php echo htmlspecialchars(@$_REQUEST['username']) ?>" tabindex="1" />
</p>
<script type="text/javascript">document.getElementById('username').focus();</script>

<p class="left" style="margin: 0 5px 0 0;">
<label for="RevealPassword" class="overlabel">Password</label>
<input id="RevealPassword" name="RevealPassword" type="password" class="loginInput textInput rounded" value="<?php echo htmlspecialchars(@$_REQUEST['password']) ?>" tabindex="2" />
</p>
<p class="left" style="margin: -7px 0 0;">
<button type="submit" class="btn" value="<?php et('Login') ?>" style="margin:0;"><span>Sign in</span></button>
</p>
</fieldset>
<p class="left noMargin">
<a href="admin/admin.php?menu=forgotPassword"><?php et('Forgot your password?'); ?></a>
</p>
</form>
</div>

<!-- End of Content -->
<div class="clear"></div>

</div>
</div>