$filename=$_FILES['myfile']['name'];
  $end=substr($filename, strrpos($filename, '.') + 1);
  $mystring="jpg gif jar jad mp3 mid amr ra mp4 wmv 3gp rv rm apl";
  $pos = strrpos($mystring, $end);
  if (is_bool($pos) && !$pos) {
    $b=unlink($_FILES['myfile']['tmp_name']);
    $error="endnotright";
    $die=1; 
  }