So, I have the following code:
    <?php
    mysql_connect("HOSTADDRESS", "USERNAME", "PASS") or die(mysql_error());
    mysql_select_db("DATABASENAME") or die(mysql_error());
    //Checks if there is a login cookie;
    if(isset($_COOKIE["ID_my_site"]))
        //If there is, it logs you in and directs you to the member page
    {
        $username = $_COOKIE["ID_my_site"];
        $pass = $_COOKIE["ID_my_site"];
        $check = mysql_query("SELECT * FROM userdata WHERE emailaddress = '$emailaddress'") or die(mysql_error());
        while($info = mysql_fetch_array( $check ))
        {
            if ($pass != $info["password"])
            {
            }
            else
            {
                header("Location: members.php");
            }
        }
    }
    //If the login form is submitted;
    if (isset($_POST["submit"])) { //If form has been submitted
        //Makes sure they are filled in
        if(!$_POST["emailaddress"] | !$_POST["pass"]) {
            die("You did not fill in all required fields.");
        }
        //Checks it against the database;
        if (!get_magic_quotes_gpc()) {
            $_POST["email"] = addslashes($_POST["email"]);
        }
        $check = mysql_query("SELECT * FROM userdata WHERE emailaddress = '".$_POST["emailaddress"]."'") or die(mysql_error());
        //Gives error if user doesn't exist;
        $check2 = mysql_num_rows($check);
        if ($check2 == 0) {
            die("That users does not exist in our database. <a href=register.php>Click here to register</a>");
        }
        while($info = mysql_fetch_array( $check ))
        {
            $_POST["pass"] = stripslashes($_POST["pass"]);
            $info["password"] = stripslashes($info["password"]);
            $_POST["pass"] = md5($_POST["pass"]);
            //Gives error if the password is wrong
            if ($_POST["pass"] != $info["password"]) {
                die("Incorrect password, please try again.");
            }
            else
            {
                //If login is ok then we add a cookie
                $_POST["emailaddress"] = stripslashes($_POST["emailaddress"]);
                $hour = time() + 3600;
                setcookie(ID_my_site, $_POST["emailaddress"], $hour);
                setcookie(Key_my_site, $_POST["pass"], $hour);
                //Then it redirects them to the members area
                header("Location: members.php");
            }
        }
    }
    else
    {
        //If they are not logged in
        ?>
        <form action="<?php echo $_SERVER['PHP_SELF']?>" method="post">
        <table border="0">
        <tr><td colspan=2><h1>Login</h1></td></tr>
        <tr><td>Email Address:</td><td>
        <input type="text" name="emailaddress" maxlength="60">
        </td></tr>
        <tr><td>Password:</td><td>
        <input type="password" name="pass" maxlength="12">
        </td></tr>
        <tr><td colspan="2" align="right">
        <input type="submit" name="submit" value="Login">
        </td></tr>
        </table>
        </form>
        <?php
    }
    ?>
When I try to login via the website, even though the password is identical to the password on the database, it reads 'Incorrect password, please try again.' If I try the password with the encryption version which is found on the database, it also shows this message. Please could someone help me with this bug?
 
     
    