PHP, MySQL สอบถามเกี่ยวกับการทำ 1 form 2 action ค๊ะ

<form action='https://www.paypal.com/cgi-bin/webscr' method='post'>
<input type='hidden' name='cmd' value='_xclick'>
<input type='hidden' name='no_note' value='1'>
<input type='hidden' name='lc' value='US' />
<input type='hidden' name='currency_code' value='USD' />
<input type='hidden' name='bn' value='PP-BuyNowBF:btn_buynow_LG.gif:NonHostedGuest'>
<input type='hidden' name='business' value='$saler'>
<input type='hidden' name='undefined_quantity' value='1'>
<input type='hidden' name='item_name' value='$item_name'>
<input type='hidden' name='item_number' value='$id'>
<input type='hidden' name='amount' value='$price'>
<input type='hidden' name='quantity' value='1'>
<input type='image' border='0' name='submit' src='http://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif'>
</form>

if(isset($_POST["submit"])){
$sql = " UPDATE payments SET pay_out_status='complete' WHERE item_number = '$id' ";
$dbQuery = mysql_query($sql); 
echo "<meta http-equiv=refresh content=1;>";
}