function newXmlHttp()
{
  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 Menu() {
  xmlHttp2 = newXmlHttp();
  xmlHttp2.open("GET", "php/menu.php", true);
  xmlHttp2.onreadystatechange=function()
  {
    if(xmlHttp2.readyState==4) {
      document.getElementById("menucontent").innerHTML = xmlHttp2.responseText;
    }
  }
  xmlHttp2.send(null);
}