Php contact form

Dear Sir,
I am new to php and i would like to know how to send php contact form messages to multiple email addresses.I tried following both methods,nothing is working(i am receving message in nandugan@gmail.com and not in vkboverseas@yahoo.com) .Kindly please help me.

first one:

<?php
if(isset($_POST[‘submit’])) {

$to = "nandugan@gmail.com","vkboverseas@yahoo.com"; 
$subject = "From Bhupinder Sood CPA Ask A Question Form";
$name_field = $_POST['name'];
$email_field = $_POST['email'];
$message = $_POST['message'];
$Telephone = $_POST['phone'];
//$dropdown = $_POST['drop_down'];

foreach($_POST['check'] as $value) {
    $check_msg .= "Checked: $value

";
}

$body = "From: $name_field

E-Mail: $email_field
Phone:$Telephone
$check_msg
Message:
$message
";

echo "&lt;meta http-equiv='refresh' content='0;url=thanks.html'&gt;";
mail($to, $subject, $body);

} else {
echo “blarg!”;
}
?>

[U]Second One:

[/U]<?php
if(isset($_POST[‘submit’])) {

$to = "nandugan@gmail.com,vkboverseas@yahoo.com"; 
$subject = "From Bhupinder Sood CPA Ask A Question Form";
$name_field = $_POST['name'];
$email_field = $_POST['email'];
$message = $_POST['message'];
$Telephone = $_POST['phone'];
//$dropdown = $_POST['drop_down'];

foreach($_POST['check'] as $value) {
    $check_msg .= "Checked: $value

";
}

$body = "From: $name_field

E-Mail: $email_field
Phone:$Telephone
$check_msg
Message:
$message
";

echo "&lt;meta http-equiv='refresh' content='0;url=thanks.html'&gt;";
mail($to, $subject, $body);

} else {
echo “blarg!”;
}
?>

Kindly,please help me.Looking forward to hear from you.

Thanks
Suvetha.