$action=$_GET["action"];
		$file_dir="images";
 		if(!isset($action)){
        	$dir=opendir($file_dir);
        	while ($file=readdir($dir)){
                if ($file != "." && $file != ".."){
					echo "<a href=".$file_dir."/".$file." target=_blank>".$file."</a><br>";
                }
        	}
        } elseif ($action == "edit") {
        	$fp=fopen($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($fp);
 		} elseif ($action == "Update"){
        	$fp=fopen($file, "w");
        	$new_content=$_POST['newcontent'];
        	rename( '$file', 'newcontent' );
        	fclose($fp);
        	echo "Updated successfully.<br><br><a href=".$_SERVER['PHP_SELF'].">Return</a>";
		}