Need to post some additional fields to my php file

Need to post some additional fields to my php file

I'm using the code below to send the selected option to a php file, and let the php file return something, that will be displayed in the div: details. 

So far no problem, but I wan't to post some additional information to my php file, namely two hidden input fields. I haven't got a clue how I can add these two input fields to the data being sended, so I appreciate any help.

My coding:
  2. <select style="margin-top:5px;" id="report">
  3.  <option value="">Select Category:</option>
  4.  <option value="spam">Spam</option>
  5.  <option value="tosv">TOS violation</option>
  6. </select>
  7. <input type="hidden" id="product_id" value="1234">
  8. <input type="hidden" id="extra" value="54321">
  10. <div id="details"></div>
  12. <script>


  15. $('#report').change(function(){
  16. $(report).hide();
  17.         $.ajax({
  18.             url: "something.php",
  19.             type: "post",
  20.             data: {option: $(this).find("option:selected").val()},
  21.             success: function(data){
  22.                 //adds the echoed response to our container
  23.                 $("#details").html(data);
  24.             }
  25.         });
  26.     });

  28. </script>