PHP EMAIL script to MULTIPLE emails

The script I have works fine but my client would like 2 emails sent from the script (its a complex registration form so I wont post the entire thing)

but so far I tired:

$toemail=“registrations@skatecanadaorangeville.ca, NBrown@PennCorp.ca”;

instead of

$toemail=“registrations@skatecanadaorangeville.ca”;

and its not working…
does anyone know how to send to more the one email?