title: error geting POST from AJAX
body: <p>when i try to retrieve a specific POST value, i get some problems.</p>
  
  <p>my ajax code: </p>
  
  <pre><code>var _data = $('#activateForm').serialize() + "&amp;1=" + name1 + "&amp;2=" + name2;
  $.ajax({
      type: "POST",
      url: "./do.php",
      data: _data,
      dataType: "json",
      success: function(msg) {
      ...
  </code></pre>
  
  <p>PHP code:</p>
  
  <pre><code>$ball = $_POST['ball']; 
  </code></pre>
  
  <p>(this "ball" is a element on <code>$('#activateForm').serialize())</code></p>
  
  <p>the result of this is all the <code>_data</code> string, not just the "ball" value.</p>
  
  <p>like: ball=dsds&amp;1=ddd&amp;2=ddfd</p>
  
  <p>how can i get a specific value?</p>
  
  <p>thank you</p>