How do I write a JavaScript file that uses jQuery?
<p>I'm new to JavaScript and JQuery. I know basic C++ and I like including header files and run functions from the header file to keep the code neat.</p>

<p>If I create a new JavaScript file how can I be sure that I can use jQuery in those external JavaScript files?</p>

<p><strong>Edit:</strong> I have the `jquery.js'. 
<strong>Edit:</strong> My question was terrible. It's taken me a while to see what I originally meant. 
          How do I use Jquery with an external JavaScript file? </p>
