Hey guys, atm I´m really stump.

Mine php skills is quite high but not mine Javascript.

Anyway for start here is mine script.

<head>

<title>Registratie</title>
<script type="text/javascript">
function dbclick()
{
alert("test");
}

</script>
</head>

<body>
Vul deze form in om je aan te melden voor de Kalender.

<form action="regcheck.php" method="post">
Gebruikers Naam<br>
<input type="text" size="15" name="ruser" id="ruser" ><br>
Persoonlijk Wachtwoord<br>
<input type="text" size="15" id="rpassword" name="rpassword"><br>
<input type="submit" ondblclick="dbclick()" id="submits" value="Aanmelden">
</form>
</body>

I´m looking for a way once a user double click the submit button that an alert message will be popped up.
Once the alert has been popped up, the page processing to regcheck.php must be stopped.