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 data = eval('(' + request.responseText + ')');
			for (var i=0; i<data.rss.channel.length; i++) {
				if (data.rss.channel[i].item) {
					var titletext = data.rss.channel[i].item.title;
					var header = document.createElement("h2");
					var headertext = document.createTextNode(titletext);
					header.appendChild(headertext);
					canvas.appendChild(header);
					var bodytext = data.rss.channel[i].item.description;
					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);
	}
}