codice:
<form action="sendsms.php" method="get">

<input type="hidden" name="username" value="<?php echo $username; ?>">
<input type="hidden" name="password" value="<?php echo $password; ?>">

<input type="text" name="from" value="">
<input type="text" name="to" value="">
<textarea name="text"></textarea>

<input type="submit" value="invia">

</form>
Volevi questo?