Altra soluzione
codice:
<!DOCTYPE HTML>  <html> 
  <head> 
    <title>Esempio</title> 
    <meta charset="utf-8"> 
    <script type="text/javascript"> 
      function validFormReg(me){ 
        if (verificainput==false) { 
         location.href="pagina_errore.html"; 
return false;   
} 
} 
    </script> 
  </head> 
  <body> 
    <form onSubmit="return validFormReg(this);" action="Registrazione.php"> 
    <input type="submit"> 
    </form> 
  </body>  </html>