Issues with ajax (POST) in Internet Explorer

Issues with ajax (POST) in Internet Explorer

I'm using ajax to send data to another page, but in IE 'message' is emptied some times.

I have an alert on 'message' in the JS-function and there is data there; for example: "I think that IE <br />is a pain in the..."

I insert all the values in MySQL, but as explained above, 'message' is emptied.

Do you have any ideas what to do?
  1. $.ajax({
  2.       type: "POST",
  3.       url: "send_ajax.php",
  4.       data: ({countries: countries, organizations: organizations, systems: systems, message: message}),
  5.       cache: false,
  6.       success: function(data) {
  7.             alert(data);
  8.       }  
  9.  });