title: Clicking Menu item then update div content with php page
body: <p>I have a logged_in.php page where you are automatically redirected to when the login succeeds. This page has a sidebar included. The menu items in the sidebar can be clicked, and I want to keep the sidebar from reloading when clicking a link. Insteed, the div right from the sidebar should be filled with page.php for example.</p>
  
  <p>How can I do this with jQuery?</p>
  
  <p>Thanks in advance</p>