var xmlHttp;

function stateChanged(){ 
	if(xmlHttp.readyState===4 || xmlHttp.readyState==="complete"){ 
		document.getElementById("feed").innerHTML=xmlHttp.responseText;
	} 
} 

function GetXmlHttpObject(){ 
	var objXMLHttp=null;
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest();
	}
	else if (window.ActiveXObject){
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	return objXMLHttp;
}
function showTweets(){
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp===null){
		alert ("Browser does not support HTTP Request");
		return;
	} 
	var url="http://tweetinthepark.com/tweets.php";
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}