Login Problem

[SJC]

When users try to login, it refreshes the page and doesn't log you in.
Here is login.php

<?php

// **********************************************************************
// Rusnak PHP Adoptables Script
// Copyright 2009 Brandon Rusnak
// For help and support: http://www.rusnakweb.com/forum/
//
// Redistribution prohibited without written permission
// **********************************************************************

// Wake the sleeping giant

// **********************************************************************
// Basic Configuration Info
// **********************************************************************

include("inc/functions.php");
include("inc/config.php");
include("lang/lang.php");

$themeurl = grabanysetting("themeurl");

// **********************************************************************
// Define our top links by calling getlinks()
// **********************************************************************

$links = getlinks();

// **********************************************************************
// Define our ads by calling getads()
// **********************************************************************

$ads = getads("login");

// **********************************************************************
// Grab any dynamic article content from the content table
// **********************************************************************

$pagecontent = getsitecontent("index");
$article_title = $pagecontent[title];
$article_content = $pagecontent[content];
$article_content = nl2br($article_content);

// **********************************************************************
// Grab any settings that we will need for the current page from the DB
// **********************************************************************

$browsertitle = grabanysetting("browsertitle");
$sitename = grabanysetting("sitename");
$slogan = grabanysetting("slogan");

// **********************************************************************
// Check and see if the user is logged in to the site
// **********************************************************************

$loginstatus = logincheck();
$isloggedin = $loginstatus[loginstatus];
$loggedinname = $loginstatus[username];

// **********************************************************************
// End Prepwork - Output the page to the user
// **********************************************************************

if($isloggedin == "yes"){

$article_title = $langislog;
$article_content = $langislogfull;

}
else{

//User is not logged in, so let's attempt to log them in...

$username = $_POST["username"];
$password = $_POST["password"];

//Clean it up

$username = preg_replace("/[^a-zA-Z0-9\\040.]/", "", $username);

$username = secure($username);
$password = secure($password);

//User is not logged in

$loginform = "<form name='form1' method='post' action='login.php'>
  <p>Username: 
    <input name='username' type='text' id='username'>
</p>
  <p>Password: 
    <input name='password' type='password' id='password'>
</p>
  <p>
    <input type='submit' name='Submit' value='Submit'>
  </p>
  <p>Don't have an account?<br>
  <a href='register.php'>Register Free</a>  </p>
  <a href='forgotpass.php'>Forgot your password?  Click Here</a>
</form>";



if($loggedinname == "" and $password == ""){
// User is viewing login form
$article_title = "Member Login:";

$article_content = $loginform;
}
else if(($username != "" and $password == "") or ($username == "" and $password != "") ){

//Something was left blank
$article_title = "Login Error:";
$article_content = "Something was left blank.  Please try logging in again.<br><br>".$loginform."";

}
else if($username != "" and $password != ""){
// Try to log the user in
$password = md5($password);

$query = "SELECT * FROM ".$prefix."users WHERE username = '$username'";
$result = @mysql_query($query);
$num = @mysql_numrows($result);

//Loop out code
$i=0;
while ($i < 1) {

$luser=@mysql_result($result,$i,"username");
$lpass=@mysql_result($result,$i,"password");

$i++;
}

if($username == $luser and $password == $lpass){
$article_title = "Login Successful!";
$article_content = "Welcome back ".$username.".  You are now logged in.  <a href='account.php'>Click Here to view or edit your account.</a>";


// Set the cookie
$Month = 2592000 + time();
setcookie("auser",$username,$Month);
setcookie("apass",$password,$Month);

}
else{
$article_title = "Login Failed!";
$article_content = "Sorry, we could not log you on with the details specified.  You can <a href='login.php'>try again</a> or <a href='forgotpass.php'>request a password reset.</a>";
$fail = 1;
}
}




}


// **********************************************************************
// Begin Template Definition
// **********************************************************************

//Define our current theme
$file = $themeurl;

// Do the template changes and echo the ready template
$template = file_get_contents($file);

$template = replace(':ARTICLETITLE:',$article_title,$template);
$template = replace(':ARTICLECONTENT:',$article_content,$template);
$template = replace(':ARTICLEDATE:',$article_date,$template);

$template = replace(':BROWSERTITLE:',$browsertitle,$template);
$template = replace(':SITENAME:',$sitename,$template);

//Define our links
$template = replace(':LINKSBAR:',$links,$template);

$topbar = gettopbar();
$template = replace(':TOPBAR:',$topbar,$template);

//Get the content for the side bar...

$sidebar = "";

if($sidebar == ""){

$sidebar = getsidebar();
}

$template = replace(':SIDEFEED:',$sidebar,$template);

//Get the ad content...
$template = replace(':ADS:',$ads,$template);

//Get the slogan info
$template = replace(':SLOGAN:',$slogan,$template);


echo $template;

// **********************************************************************
// End Template Definition
// **********************************************************************



?>