Various PHP Progress Bar Scripts. The tutorial can be read from here:
Using PHP flush method: http://w3shaman.com/article/php-progress-bar-script
Using Ajax method: http://w3shaman.com/article/php-ajax-progress-bar
The live examples can be tried from here:
The PHP flush method: http://stuff.w3shaman.com/php-progress-bar/
The Ajax method: http://stuff.w3shaman.com/php-ajax-progress-bar/