How to set up a progress bar

I have a php page named import.php. while executing this file a lot of database operation is doing.So i need to show the progress to the user, by using a progres bar.How is it possible using any of these php ajax, javascript, jquery,css, flash开发者_C百科... methods

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Here is a good tutorial on it:

http://net.tutsplus.com/tutorials/javascript-ajax/create-a-progress-bar-with-javascript/

and the demo

Here is the php implementation too.