title: Specify the callback parameter with JQuery.getJSON
body: <p>Is there any way to specify the value of the callback parameter when using JQuery's getJSON method?</p>
  
  <p>For example:</p>
  
  <pre><code>$.getJSON('/content?callback=?', function(data) {});
  </code></pre>
  
  <p>Generates the following URL:</p>
  
  <pre><code>content?callback=jQuery15108431726952168015_1299633045933&amp;_=1299633046552
  </code></pre>
  
  <p>The parameter here is generated randomly by the library.</p>
  
  <p>I would like to specify my own callback parameter.</p>
  
  <p>I would like to use the same callback parameter for every request so I can aggresively cache the response. </p>