var xmlhttp;

function loadXMLDoc(url){
	xmlhttp=null;
	if(window.XMLHttpRequest){xmlhttp=new XMLHttpRequest();}// code for IE7, Firefox, Opera, etc.
	else if(window.ActiveXObject){xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}// code for IE6, IE5
	if(xmlhttp!=null){
	  xmlhttp.onreadystatechange=state_Change;
  	xmlhttp.open("GET",url,true);
  	xmlhttp.send(null);
  }else{alert("Your browser does not support XMLHTTP.");}
}

function state_Change(){
	if(xmlhttp.readyState==4){// 4="loaded"
  	if(xmlhttp.status==200){document.getElementById('extContent').innerHTML=xmlhttp.responseText;}// 200="OK"
		else{alert("Problem retrieving XML data:" + xmlhttp.statusText);}
  }
}