PHP form problem (uber newbie)

[Ammar]

what I'm trying to do is to make it so that if the "email address" field is not filled out, and error message appears stating that one of the required fields has not been properly filled out. this is the code I have so far.

<?
if (isset($_POST['name'])) {

$name=$_POST['name'];
$address=$_POST['address'];
$email=$_POST['email'];
$subject=$_POST['subject'];
$textarea=$_POST['textarea'];
$to="[e-mail]";



mail($to,$textarea,"From: $email\n");

echo "Thanks for your message.";

}

if (!isset($_POST['name'])) {
?>

(this doesnt include the HTML code.

[ShawnK]

if( empty($_POST['name']) || empty($_POST['email']) || empty($_POST['etc']))
{
   echo "1 or more fields have not been filled out completly";
}
else
{
   // process info here
}

The key part is the empty function which suprisingly checks to see if a variable is empty...and the || operator...that means or so if this field is empty or this one or this one, if you want to add more fields just add a || then empty($_POST['field_name'])