Untitled

<html>
<body>

<?php

require ('connect.php');
session_start();
$sesuser = @$_SESSION['username'];
$username = strip_tags( @$_POST['username']);
$password = strip_tags (@$_POST['password']);
$repeatpassword = strip_tags (@$_POST['repeatpassword']);
$submit = @$_POST['submit'];
if ($sesuser)
{
die ("you are already logged in <a href='index.php'> click here </a> to return to the home page ");

}else {

if ($submit)
{
    if ($username&&$password&&$repeatpassword)
    {
        $regquery = mysql_query ("SELECT * FROM users WHERE username = '$username'");
        $numrows = mysql_num_rows ($regquery);

        if ($numrows)
        {
            echo "user already exists";
            } else  {

                if ($password == $repeatpassword)
                {
                    $password = md5 ($password);
                    $date = date("Y-m-d");
                    $insertquery = mysql_query("INSERT INTO users VALUES ('','$username',$password','$date')");
                    die ("successfully registered");

                    }else  {
                        echo "passowrds do not match";
                    }
                }

        } else {
            echo "please fill out all fields";
            }
        }


}
?>

<form action='register.php' method="POST" >
<table>
<tr>
<td>
Username:
</td>
<td>
<input type='text' name="username" />
</td>
</tr>

<tr>
<td>
Password:
</td>
<td>
<input type='password' name="password" />
</td>
</tr>

<tr>
<td>
Repeat Password:
</td>
<td>
<input type='password' name="repeatpassword" />
</td>
</tr>
<tr>
<td>
<input type="submit" name="submit" value="Submit" />

</td>
</tr>

</table>
</form>
</body>
</html>