var xmlConfig=null;
function openConfig(configFile) {
  if (window.ActiveXObject)
  {// code for IE
    xmlConfig=new ActiveXObject("Microsoft.XMLDOM");
  }
  else if (document.implementation.createDocument)
  {// code for Mozilla, Firefox, Opera, etc.
    xmlConfig=document.implementation.createDocument("","",null);
  }
  else
  {
	alert("Problem loading XML config");
    return null;
  }
  if (xmlConfig!=null)
  {
    xmlConfig.async=false;
    xmlConfig.load(configFile);
  }
  return xmlConfig;
}