We have an aviation website addressed magicofflight dot com for which we have applied cache headers. We want to reload the client side cache whenever we need. How do we do that? If we set the client side version the entire image set gets redownloaded. Is there any way we can set cache version for individual file. Please have at look at the site.

This is an idea that should work and you can do it selectively for the pages that you don't want to cache:

Caching. *IF* this is a caching-issue, just append some timestamp to the
url to prevent caching.
From php:
<a href="detailedview.php?recordid=<?= $recordid ?>&t=<?= microtime() ?>">
recordlink here</a>

I just made up the recordid, I guess you managed that part already.
The addition t=543289765983475 makes sure every url is different each time.
That will prevent retrieving cached records.

As a general reference, this is a pretty good tutorial on caching:
http://www.mnot.net/cache_docs/

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