title: How do you add a parameter to a URL and reload the page
body: <p>I'm looking for the simplest way to add parameters to a URL and then reload the page via javascript/jquery. I'm trying to avoid any plugins. Essentially I want:</p>
  
  <pre><code>http://www.mysite.com/about
  </code></pre>
  
  <p>to become:</p>
  
  <pre><code>http://www.mysite.com/about?qa=newParam
  </code></pre>
  
  <p>or, if a parameter already exists, then add a second parameter:</p>
  
  <pre><code>http://www.mysite.com/about?qa=oldParam&amp;qa=newParam
  </code></pre>