jquery cycle question

jquery cycle question

Hello,

I am using a database to access with a simple ajax script

see following example

<script type="text/javascript">
$(document).ready(function() { 
    // start slideshow 
    $('#content1').cycle({ 
        fx:      'curtainX', 
        timeout:  2000, 
before:MakeRequest()
    }); 

}); 

</script> 
</head>

<body>

<div id="content1" class="content1">
<img src="image1.png">
<img src="image2.png">

</div>

ajax script
function getXMLHttp()
{
  var xmlHttp

  try
  {
    //Firefox, Opera 8.0+, Safari
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    //Internet Explorer
    try
    {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e)
    {
      try
      {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch(e)
      {
        alert("Your browser does not support AJAX!")
        return false;
      }
    }
  }
  return xmlHttp;
}
function MakeRequest()
{
  var xmlHttp = getXMLHttp();
  
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.open("post", "_php/gastenboek.php", true); <== is this the problem ?
  xmlHttp.send(null);
}
function HandleResponse(response)
{
  document.getElementById('content1').innerHTML = response;
}

php code gastenboek.php opens a very simple database with picture names 

This works for google chrome but not for firefox or IE ,they just display the pictures sequential

any ideas ?

By the way I have changed
  xmlHttp.open("post", "_php/gastenboek.php", true); true to false

  xmlHttp.open("post", "_php/gastenboek.php", false);now it is working for ie 

but firefox still give a problen