Logging In Problem O_O

[Abronsyth]

This is a some what serious problem, it seems none of my users, nor myself, are able to login to the site. The password resets are not working, I even changed a user's password for them, but the password didn't work. Here's my login.php, hope someone can see something I've missed!

<?php
include("inc/functions.php");

//***************//
//  START SCRIPT //
//***************//


if($isloggedin == "yes"){
$article_title = $langislog;
$article_content = $langislogfull;
echo 'no';
}else{

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

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

//User is not logged in

$article_content = "<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'";
$result = @runquery($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;
}
}




}


//***************//
//  OUTPUT PAGE  //
//***************//

echo showpage($article_title, $article_content, $date);

?>

Hm, never mind, it seems like all parts of the script are there, yet it's still not working? Does something seem abnormal to anyone?