var xmlHttp;
var ajaxon = true;

function setAJAX() {
  try { xmlHttp=new XMLHttpRequest(); }
        catch (e) { try { xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); }
        catch (e) { try { xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); }
        catch (e) { alert("Please use an AJAX compatible browser!"); ajaxon = false }
        } }
  }

function xmlHeader() {
  xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xmlHttp.setRequestHeader("lastCached", new Date());
  xmlHttp.setRequestHeader("Content-length", parms.length);
  xmlHttp.setRequestHeader("Connection", "close");
  }