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copied!<ol> <li>load jQuery 1.4</li> <li>load all plugins which need to use 1.4</li> <li>use <code>noConflict</code></li> <li>load jQuery 1.6</li> </ol> <p>The problem is that jQuery plugins tend to be written this way:</p> <pre><code>(function($) { // plugin code using $ for jQuery calls })(jQuery) </code></pre> <p>i. e. they have an internal copy of whatever <code>window.jQuery</code> was at the time the plugin loaded, and you cannot change that afterwards.</p> <p><strong>update:</strong> a little more detail on how <code>noConflict</code> works (was too long for the comments). When you load jQuery, it creates an object containing all its functions and data, and sets <code>window.$</code> and <code>window.jQuery</code> to that object. The old value of <code>window.$</code> and <code>window.jQuery</code> is saved in the object.</p> <p>When you call <code>noConflict</code>, it restores the saved value (by default for <code>$</code>; if you call it with <code>true</code>, also for <code>jQuery</code>). This is useful if you had something in those variables <em>before</em> loading jQuery, and don't want it to be overwritten. E.g. if you loaded things like this:</p> <ol> <li>load jQuery 1.6</li> <li>load jQuery 1.4</li> <li>call <code>noConflict(true)</code></li> </ol> <p>then the first step would put jQuery 1.6 into <code>$</code> and <code>jQuery</code>, the second would overwrite them with 1.4, and <code>noConflict</code> would restore <code>$</code> and <code>jQuery</code> to the 1.6 version. </p> <p>But since you load 1.4 first, and call <code>noConflict</code> between the two, the old value for <code>$</code> and <code>jQuery</code> which is restored is <code>undefined</code>, which is not particularly useful, and will be overwritten by 1.6 anyway, so the <code>noConflict</code> call does not do anything useful beyond returning the value of <code>$</code> which then can be stored by some other name (<code>$mc</code> in this case). <code>var $mc = $;</code> would work just as well for that.</p> <p>As for the plugins, the auto-executing function copies the value of <code>window.jQuery</code> at the moment the plugin is loaded, and it does not matter at all what happens to <code>window.jQuery</code> afterwards:</p> <pre><code>window.jQuery = 'foo'; (function($) { window.fun = function () { console.log($); } })(jQuery); window.jQuery = 'bar'; fun(); // will log 'foo' </code></pre>

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