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http://stackoverflow.com/questions/166221/how-can-i-upload-files-asynchronously

There are various ready-made plugins on doing file upload for jQuery.

Doing this kind of uploading hacks is not an enjoyable experience, so people enjoy using ready-made solutions.

Here's few:

JQuery File Uploader

Multiple File Upload Plugin

Mini Multiple File Upload

jQuery File Upload

Very few days back I had posted an article about Multiple ajax image upload without refreshing the page using jquery and PHP. In this post I have updated few lines of code that allows to user can select and upload multiple images in single shot, thanks toLakshmi Maddukuri for sending me a useful piece of code. Just take a quick look this live demo. 

Here is an extra feature that can be added to login system for an extra layer of security. It is 2 factor authentication using Google Authenticator App for Android/iPhone. Your account could be at risk of having your password stolen. 2 step verification can protect from misuse of your account if someone have your password, because logging into your account always require a security code(this verification code is uniquely designed for your account, if you opt for verification code, an unique code is sent to your mobile for every 30-60 seconds) in the second step after you enter your password.