How To Hide A Folder In A Java Nokia Phone

I knew many of people have a lot of secret stuff on their phone which thew want to hide like musics,game,videos,and other files.which will be hidden in the phone and make the folder invisible which can be done by a single application on java and the application also has it's own password used to secure it if any other person wants to use it to open any file and also if this application is deleted it will still hide those folders unless you go and download it again.The name of this software is "smartgallery" java it can be found in google and also in www.wap.in,www.gamawap.com and other java sites.Here is a download link http://wap.in/load-game/S78/SmartGallery.jad