Check the documentation of your Web Server software to see what kind of cache control it provides for files. HTTP caching is controlled by a header sent along with the page (or file) that tells caching proxies and requesting clients how long the file is valid. Browsers will not re-request a file that the server has indicated is still valid unless the user refreshes the page. You may be able to turn caching in the Blackberry off, or reduce it, but you users are not likely to be happy with the results.
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