function ajaxFunction()
{
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;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
    {
    if(xmlHttp.readyState==4)
      {
 	theDiv = window.document.getElementById('ajax_menu');
	theDiv.style.visibility = 'hidden'; 
	theDiv.innerHTML = xmlHttp.responseText;     
 ddtreemenu.createTree("treemenu2", true, 5);
 theDiv.style.visibility = 'visible'; 
      }
    }
  xmlHttp.open("GET","ajax_menu.php?get_tree_menu=true",true);
  xmlHttp.send(null);
  }
  
 window.onload=function(){
 ajaxFunction();
}