[Javascript] Auto reloading JS files on change?

[Rees, Mark]

I have the following in an HTML file that is 
echo'd to the browser via PHP code.

<script src="ajax/players.js" 
type="text/javascript"></script>

But whenever this, and other, .js files are 
modified the user must know to hit the refresh 
button on his browser.

I've been looking for a way to reload the JS files 
on changes, and I've come across the last-modified 
header element, but not sure how to implement this.

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Assuming you have the above script element in a site-wide include file or similar, one option is to rename the js file when you change it - you can use a version number: for example players_105.js. If other applications need to access it that may not work well for you though.