Including a single javascript file on multiple domains

I have multiple domains with multiple copies of jQuery.js in separate subfolders. I want to consolidate them so there's only one, and so there's no reference in one domain to another so I can use the same one fo开发者_运维技巧r work and personal.

Furthermore, I don't want to use symbolic links because I'll be moving servers sometime this year and I feel that a lot of symlinks could complicate things. One idea I had was instead of this in the HTML:

<script src="js/jquery.min.js" type="text/javascript"></script>

to do this:

<script src="jquery_min_js.php" type="text/javascript"></script>

And that file will look like this:

<?php echo '/home/path/to/js_files/js/jquery.min.js' ?>

Is there a smarter way to do this? I'd like to somehow make a function so like

<script src="get_javascript.php?script=jquery_min_js" type="text/javascript"></script>

and then get_javascript.php might look like:

<?php echo '/home/path/to/js_files/js/'.str_replace('_','.',$_GET['script']).'.js' ?>

Am I barking up the wrong tree? Am I even in the right forest?

One idea is to include from google code:

 <script type="text/javascript src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>

3 reasons why:

http://encosia.com/2008/12/10/3-reasons-why-you-should-let-google-host-jquery-for-you/

You can link to jQuery from either Google or Microsoft.

<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.5.1.min.js"></script>

or

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js">`</script>