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I had an interesting issue where one script I was using wouldn’t work above 1.2.8 but for the remainder of the project I wanted to use the up to date jQuery version.

After starting to rebuild the contribution and deciding against it I chose to try and setup multiple jQuery versions working alongside each other! It turned out to be quick and easy so read on if you want to find out how:

Much like preparing jQuery for noConflict with other Libraries you can use this technique to run multiple version of jQuery too!

Regular preparation for noConflict:

<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
   $.noConflict();
   jQuery(document).ready(function($) {
      // Code that uses jQuery's $ can follow here.
   });
   // Code that uses other library's $ can follow here.
</script>

Preparation using noConflict to use two versions of jQuery:

<script type="text/javascript" src="jquery-1.2.8.js"></script>
<script>
   $jQuery_128 = $.noConflict(true);
</script>
<script>
   // Link all your Js you want 128 linked to here!
   // Change your jQuery objects to "$jQuery_128"
   // eg:
   $jQuery_128(document).ready(function() {
      // You need to use the "$jQuery_128" namespace herein
   });
</script>
<script type="text/javascript" src="jquery-latest.js"></script>
// Code that uses latest library follow on here!

Because I set the [removeAll] all as true this disables the default namespaces:

$jQuery_128 = jQuery.noConflict( [removeAll] )

This mean that the “$” and “jQuery” namespaces no longer work for version 1.2.8 [as per example above] so this always requires the use of the newly assigned namespace “$jQuery_128″. Thus the latest version of jQuery running alongside this one can use the “$” and “jQuery” namespaces without problem.

Eg:

$j_128(document).ready(function() {
   alert('We are using jQuery 1.2.8');
});

That should just about do it! Run old alongside new!
Give it a whirl.

Useful reference: http://api.jquery.com/jQuery.noConflict/