Error syntax php aide

<?php

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

	$username = htmlspecialchars(trim($_POST['username']));
	$password = htmlspecialchars(trim($_POST['password']));
	$repeatpassword = htmlspecialchars(trim($_POST['repeatpassword']));

	if($username&&$password&&$repeatpassword)
	{
		if(strlen($username)>=4)
		{
			if(strlen($password)>=6)
			{
				if($password==$repeatpassword)
				{
	
	$password = md5($password);
	
	mysql_connect('localhost','root','');
	mysql_select_db('phpmembre');
	
	$query = mysql_query("
	
	INSERT INTO users VALUES('','$username','$password')
	
	");
	
	}else echo "Les mots de passe ne sont pas identiques";
	}else echo "Le mot de passe est trop court";
	}else echo "Veuillez saisir tous les champs";

}
?>

<title>Inscription</title>

<h1>Inscription</h1>
<form method="post" action="register.php">
<p>Votre nom d'utilisateur</p>
<input type="text" name="username">
<p>Votre mot de passe</p>
<input type="password" name="password">
<p>Répétez votre mot de passe</p>
<input type="password" name="repeatpassword"><br></br>
<input type="submit" name="submit" value="Valider">
</form>