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<?php
session_start();
$_SESSION["dir_open"][$_GET["id"]]=(!isset($_SESSION["dir_open"][$_GET["id"]]))?false:(!$_SESSION["dir_open"][$_GET["id"]]);
if($_SESSION["dir_open"][$_GET["id"]])
{
$img="open";
}
else
$img="closed";
echo $img."_".$_GET["id"];
?>