Useful information about AJAX file uploads and progress bards

Demo jQuery Form http://malsup.com/jquery/form/progress.html

https://www.sitepoint.com/tracking-upload-progress-with-php-and-javascript/

https://www.sitepoint.com/html5-javascript-file-upload-progress-bar/

http://stackoverflow.com/questions/15410265/file-upload-progress-bar-with-jquery