Winziges PHP Script

<?php
$host = "localhost";
$user = "root";
$pass = "1234";
$db = "Plain";


mysql_connect($host, $user, $pass);
mysql_select_db($db);


if(isset($_POST['register'])) {
	$accounts = mysql_query("SELECT `id` FROM `accounts` WHERE `accountname` = '".mysql_real_escape_string($_POST['account'])."' ");
	
	if(!$accounts) {
	    die('MYSQL Fehler (Oben): '.mysql_errno().': '.mysql_error());
	}
	
	
	if(mysql_num_rows($accounts) > 0) {
		echo "Der Username ist bereits vergeben!";
	} else {
		$result = mysql_query("INSERT INTO `accounts`(`accountname`, `password`, `email`) VALUES ('".mysql_real_escape_string($_POST['account'])."', '".mysql_real_escape_string($_POST['password'])."', '".mysql_real_escape_string($_POST['email'])."')");


		if(!$result) {
	    	die('MYSQL Fehler (Unten): '.mysql_errno().': '.mysql_error());
		}


		echo "Der Account wurde erfolgreich angelegt!";
    }
} else {
	echo "
		<html>
			<form method=\"POST\" action=\"\">
				Account: <input type=\"text\" name=\"account\"><br />
				E-Mail: <input type=\"text\" name=\"email\"><br />
				Password: <input type=\"password\" name=\"password\"><br />
				<input type=\"submit\" name=\"register\" value=\"Registrieren\">
      		</form>
     	</html>
	";
}
?>