if($_POST){
$name = trim(mysql_real_escape_string($_POST["name_popup"]));
$email = trim(mysql_real_escape_string($_POST["email_popup"]));
$subject = trim(mysql_real_escape_string($_POST["subject_popup"]));
$body = trim(mysql_real_escape_string($_POST["body_popup"]));
if($name && $email && $subject &&  $body){
$insert = mysql_query("INSERT INTO mesajlar(name,email,subject,body) VALUES('$name','$email','$subject','$body')");
if($insert){
echo "mesaj eklendi";
}
else{
echo "hata var: ".mysql_error();
}
}
else { echo "boş alan var"; }
}