title: AJAX request only works once in IE
body: <p>I have this issue, in FF it works great but in IE only works once...
  the html is </p>
  
  <pre><code>&lt;form&gt;
  &lt;input type="button" value="test" onclick="javascript:vote();"/&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>the javascript</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  
  function vote(){
  
  
  if (window.XMLHttpRequest)
    {// code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
  
  
    }
  else
    {// code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  
    }
  
  
  xmlhttp.open("GET","../php/votes.php",true);
  xmlhttp.send(null);
  
  }
  
  &lt;/script&gt;
  </code></pre>
  
  <p>and the PHP code is only a update</p>
  
  <pre><code>&lt;?php
  $con = mysql_connect("localhost","mylog","mypass");
  if (!$con)
    {
    die('Could not connect: ' . mysql_error());
    }
  
  mysql_select_db('versus',$con);
  
  mysql_query("update picture_vs set votes = votes + 1");
  
  
  ?&gt;
  </code></pre>
  
  <p>any idea?</p>