title: Execute PHP without leaving page
body: <p>I have a form - textarea (named <code>su</code>) and submit button. </p>
  
  <p>When the form is submitted, I need to</p>
  
  <ol>
  <li>run a PHP script without refreshing/leaving page</li>
  <li>"echo" or somehow print a return on the screen</li>
  </ol>
  
  <p>I'm pretty sure this works via some kind of ajax request thing. but I have no idea how.</p>
  
  <p>Like I said I'm uneducated with ajax or java. A quick example would be wonderful.</p>