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copied!<p>Its hard to tell what you are doing with your library, but it seems you are building some type of widget for use on multiple sites.</p> <p><em>From here down has been updated after an enlightening comment from @K Prime caused me research exactly how you could include two copies of jQuery if needed:</em></p> <p>It is <em>generally</em> bad to use jQuery if you are building a widget that will live on a site <em>outside</em> your control, and will be added to the site with a "copy this embed code and paste onto your site" type of functionality. <em>(Of course jQuery widgets and plugins abound, but these are normally chosen and installed/implemented by developers not a generic "copy-n-paste" widget type implementation)</em></p> <p>Probably the biggest reason (after realizing you <em>can</em> run two copies of jQuery on the same page) is the file size increase. Whether it is warranted will depend on your particular needs and function. Simple small widget = straight JS. Complex website front-end extension, then it probably is worth the file-size increase.</p> <p>To include it properly (so you don't run into conflicts on their site) follow a workflow that looks something like this:</p> <ol> <li>Dynamically add jQuery to their page using the Google APIs as mentioned on the other answers here.</li> <li>Run <code>var mywidget_jQuery = $.noConflict( true );</code> which will restore the original meaning of <code>$</code> <em>and</em> restore the original meaning of <code>window.jQuery</code>.</li> <li>Dynamically add your script file, but be sure to wrap the entire thing in a self executing anonymous function like this:</li> </ol> <p><strong>JS</strong></p> <pre><code>(function($){ ... Your code here ... })(mywidget_jQuery); </code></pre> <p>Now, you can safely use <code>$</code> inside your special function and all the jQuery features you want without issue.</p> <p><strong>Extra credit</strong> You could wrap steps 1 and 2 in an if statement that tests if <code>window.jQuery</code> is defined and if it, test if <code>jQuery.fn.version</code> is high enough to run your code. If either test fails, then run steps 1 and 2. If it passes, however, then just run <code>var mywidget_jQuery = window.jQuery</code> so the script you include in step 3 will still run.</p>

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