function xhrObj()
{
  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 main_menu_xhr(file, table_data)
{
  var xmlHttp = xhrObj();
  if (xmlHttp == null) {
	return false;
  }
  xmlHttp.onreadystatechange=function()
  {
      if(xmlHttp.readyState==4)
        {
          table_data.innerHTML = xmlHttp.responseText;
          return true;
        }
   }
    xmlHttp.open("GET","/"+file+".html",true);
    xmlHttp.send(null);
}