Untitled

<?php
echo "<h1>Register</h1>";
if (isset($_POST['submit']))
{

	$submit = $_POST['submit'];

	//form data
	$fullname = strip_tags($_POST['fullname']);
	$username = strip_tags($_POST['username']);
	$password = strip_tags($_POST['password']);
	$repeatpassword = strip_tags($_POST['repeatpassword']);
	$date = date ("y-m-d");

	if ($submit)
	{
		// check for existance
		if ($fullname&&$username&&$password&&$repeatpassword)
		{
			if ($password==$repeatpassword)
			{
				//check char length of username and fullname
				if (strlen($username)>20||strlen($fullname)>20)
				{
					echo "Length of username or fullname is to long!";
				}
				else
				{
					// check password length
					if (strlen($password)>20||strlen($password)<6)
					{
						echo "Password must been between 6 and 20 characters";
					}
					else
					{
						// register the user!
						// encrypt password
						$password = md5($password);
						$repeatpassword = md5($repeatpassword);

						//open database
						mysql_connect("localhost","root","usbw");
						mysql_select_db("phplogin"); //select database

						$queryreg = mysql_query("
						INSTERT INTO users VALUES ('','$fullname','$username','$password','$date')
						");

						die ("You have been registered! <a href='index.php'>Return to login page</a>");

					}
				}
			}
			else
			{
				echo "You passwords do not match!";
			}
		}
		else
		{
			echo "Please fill in <b>all </b> fields!";
		}
	}
}
else
{
?>

<html>
<p>
<form action="register.php" method="post">
		<table>
				<tr>
					<td>
					Your full name:
					</td>
					<td>
					<input type='text' name='fullname'>
					</td>
				</tr>
				<tr>
					<td>
					Choose a username::
					</td>
					<td>
					<input type="text" name="username">
					</td>
				</tr>
				<tr>
					<td>
					Choose a password:
					</td>
					<td>
					<input type="password" name="password">
					</td>
				</tr>
				<tr>
					<td>
					Repeat your password:
					</td>
					<td>
					<input type="password" name="repeatpassword">
					</td>
				</tr>
		</table>
		<p>
		<input type="submit" name="submit" value="register">
</form>

</html>
<?php
}
?>