Unusual error in $_POST [HELP]

$general = $_POST['general'];
$body = mysql_prep($_POST['body']);
$dsply = mysql_prep($_POST['dsplay']);
$snd = mysql_prep($_POST['sound']);
$mem = mysql_prep($_POST['mem']);
$dt = mysql_prep($_POST['data']);
$cmra = mysql_prep($_POST['camera']);
$ftre = mysql_prep($_POST['features']);
$btry = mysql_prep($_POST['battery']);
//mysql query goes here

$editQuery = "INSERT INTO modelname";
$editQuery .=" VALUES( '";
$editQuery .=" $brandposition','$setposition','$modelname','$picture','$general','{$body}','{$dsply}','{$snd}','{$mem}','{$dt}','{$cmra}','{$ftre}','{$btry}','{$price}')";


these are the data taken from the form

but still the error shows

Notice: Undefined index: general in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 65

Notice: Undefined index: body in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 66

Notice: Undefined index: dsplay in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 67

Notice: Undefined index: sound in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 68

Notice: Undefined index: mem in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 69

Notice: Undefined index: data in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 70

Notice: Undefined index: camera in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 71

Notice: Undefined index: features in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 72

Notice: Undefined index: battery in D:\xampp\htdocs\onairgsm\newgsm\insert_model.php on line 73

 

It tells you that the variables don't exists! so when you submit the form, these values are not posted!