gistfile1.js

var c = Titanium.Network.createHTTPClient();
c.onload = function() {
	var f= Titanium.Filesystem.getFile("xhr.png");
	f.write(this.responseData);
	document.getElementById('html').innerHTML = '<img src="'+f.url+'"/>';
};
// open the client
c.open('GET','http://www.appcelerator.com/wp-content/uploads/2009/06/titanium_desk.png');
// send the data
c.send();