Unnamed

<?php$file_dir="images";if(!isset($_REQUEST['action']))$action = $_REQUEST['action'];{	$dir=opendir($file_dir);	while ($file=readdir($dir))	{		if ($file != "." && $file != "..")		{			echo "<a href=".$file_dir."/".$file." target=_blank>".$file."</a>";		}	}}else if ($action == "edit"){	$file = $_REQUEST['file'];	$fp=fopen($file, "a+");	echo "<form action = ".$_SERVER['PHP_SELF']."?action=update&file=".$file." method = post><textarea rows=20 cols=60 name = newcontent></textarea><br><input type = submit value = Update></form>";	fclose($fp);}else if($action == "update"){	$file = $_REQUEST['file'];	$fp=fopen($file, "w");	$new_content=$_POST['newcontent'];	rename( '$file', 'newcontent' );	fclose($fp);	echo "Updated successfully.<br><br><a href=".$_SERVER['PHP_SELF'].">Return</a>";}?>