registration

<!doctype html>
<html>
<head>
<title>Register</title>
<meta charset="utf-8"/>
<title>Login</title>
<link rel="stylesheet" href="css/reset.css"/>
    <link rel="stylesheet" href="css/960.css"/>
    <link rel="stylesheet" href="css/main.css"/>
</head>
<body>
<div class="header">
            <div class="container_12">
                <div class="grid_12">
                    <h1 class="knobcloud-header">KNOBCLOUD</h1>
                </div>
            </div>
        </div>
<p><a href="register.php">Register</a> | <a href="login.php">Login</a></p>
<h3>Registration Form</h3>
<form action="" method="POST">
username: <input type="text" name="user"><br />
password: <input type="password" name="pass"><br />
<input type="submit" value="register" name="submit" />
</form>
<div class="body">
            <div class="container_12">
                <div class="grid_12">
                    <div id="body">
                    </div>
                </div>
             </div>
         </div>
<?php

if(isset($_POST["submit"])){

if(!empty($_POST['user']) && !empty($_POST['pass'])) {
	$user=$_POST['user'];
	$pass=$_POST['pass'];

	$con=mysql_connect('localhost','root','') or die(mysql_error());
	mysql_select_db('user_registration') or die("cannot select DB");

	$query=mysql_query("SELECT * FROM login WHERE username='".$user."'");
	$numrows=mysql_num_rows($query);
	if($numrows==0)
	{
	$sql="INSERT INTO login(username,password) VALUES('$user','$pass')";

	$result=mysql_query($sql);


	if($result){
	echo "Account Successfully Created";
	} else {
	echo "Failure!";
	}

	} else {
	echo "That username already exists! Please try again with another.";
	}

} else {
	echo "All fields are required!";
}
}
?>


</body>
</html>