I do not think that will do for
minhtri, since the headline says
progressbar. The question is probably if it is possible to know the loading time before loading the page, so that it is possible to show a progress bar during the load process, right!?
The progress bar has been discussed several times. I do not think it is possible what you want
minhtri, however you could do one of those progress bars that does not end, but show that the page is loading. Take a look at e.g.
www.speednames.com and search for a domain. This will show you such a progress bar.
Jacob.