My Attempt

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Php Page</title>
</head>

<form action="welcome.php" method="post">
User: <input type="text" name="user" />
Password: <input type="password" name="password" />
<input type="submit" />
</form>
</form>

</body>
</html>


Welcome.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<?php
$con = mysql_connect("localhost","root","0000");
if (!$con)
{
    die('Count not connect: ' . mysql_error());
} else
{
    mysql_select_db("phptest", $con);
    $sql = "CREATE TABLE IF NOT EXISTS users
    (
    personID int NOT NULL AUTO_INCREMENT,
    PRIMARY KEY(personID),
    Username varchar(15),
    Password varchar(15)
    )";

    mysql_query($sql,$con);
    $user = $_POST["user"];
    $pass = $_POST["password"];

    $sql2 = "SELECT * FROM users
    WHERE Username='$user'
    ";
    $result = mysql_query($sql2,$con);
    if($result === FALSE) {
        die(mysql_error());
    } else
    {
    if(mysql_fetch_array($sql2) === FALSE) {
        die(mysql_error());
    } else
    $row = mysql_fetch_array($sql2);
    if ($row['Password'][0] == $pass)
    {
        echo "You Have Logged in correctly";
    } else
    {
        echo "User and Password do not match";
    }
    }

}
?>
<body>
</body>
</html>