function createRO(){
  var tmpRO;
  
  //For non-IE browsers
  if(window.XMLHttpRequest){
    tmpRO = new XMLHttpRequest();
  }
  else if(window.ActiveXObject){
    tmpRO = new ActiveXObject("Microsoft.XMLHTTP");   
  }
  else{
    tmpRO = null;
  }
  //Return our object or null
  return tmpRO;
}

function getNodeValue(obj, tag){
  return obj.getElementsByTagName(tag)[0].firstChild.nodeValue;
}