function getHTTPObject() {
	var xhr = false;
	if (window.ActiveXObject) {
		try {
			xhr = new ActiveXObject("Msxml2.XMLHTTP");
		} catch(e) {
			try {
				xhr = new ActiveXObject("Microsoft.XMLHTTP");
			} catch(e) {
				xhr = false;
			}
		}
	} else if (window.XMLHttpRequest) {
		try {
			xhr = new XMLHttpRequest();
		} catch(e) {
			xhr = false;
		}
	}
	return xhr;
}

function grabFile(file) {
	var request = getHTTPObject();
	if (request) {
		request.onreadystatechange = function() {
			parseResponse(request);
		};
		request.open( "GET", file, true );
		request.send(null);
	}
}

function parseResponse(request) {
	if (request.readyState == 4) {
		if (request.status == 200) {
			var canvas = document.getElementById("container");
			emptyElement(canvas);
			var items = request.responseXML.getElementsByTagName("item");
			for (var i=0; i<items.length; i++) {
				var titletext = items[i].getElementsByTagName("title")[0].firstChild.nodeValue;
				var header = document.createElement("h2");
				var headertext = document.createTextNode(titletext);
				header.appendChild(headertext);
				canvas.appendChild(header);
				var bodytext = items[i].getElementsByTagName("description")[0].firstChild.nodeValue;
				var para = document.createElement("p");
				var paratext = document.createTextNode(bodytext);
				para.appendChild(paratext);
				canvas.appendChild(para);
			}
		}
	}
}

function emptyElement(element) {
	while (element.hasChildNodes()) {
		element.removeChild(element.lastChild);
	}
}