title: Transform this function completely to jQuery
body: <p>I need this function as jQuery.</p>
  
  <p>There is a part jQuery but I am finding a tough time to write the code!</p>
  
  <pre><code>function showUser(str) {
      if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
          xmlhttp = new XMLHttpRequest();
      } else { // code for IE6, IE5
          xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      xmlhttp.onreadystatechange = function () {
          if (xmlhttp.readyState == 4 &amp;&amp; xmlhttp.status == 200) {
              document.getElementById("drop_em").innerHTML = xmlhttp.responseText;
              $('#scrollbar3').tinyscrollbar();
          }
  
      }
      xmlhttp.open("GET", "list_playlist_popup.php?qq=" + str, true);
      xmlhttp.send();
  }
  </code></pre>