So the little XML mini me is great for simple stuff but when you really need to do real work with XML you really need a more robust solution that includes a real XML parser.  Now that can prove problematic especially when it has to work in lots of browsers.  To address this problem with my own work I wrote another class that wraps the cross browser functionality and wraps some key elements that I use.  Typically I need things like all of properties of a given node in a list in the form of an array.  Plus things like xPath and the like for Silverlight. 

 So the attached javascript class wraps the core functionality.  It includes the HTTP request functionality and XML parsing with the other bits I 'might' need.  Basically the class works like this:

var NewDOM = new XML();
NewDOM.Load("Sample.xml");

This code fires when the html page script code behind fires.  When you call 'Load' and pass a url to an xml file it then depending on the browser it uses the appropriate HTTP request object to load the file and assign the onload event.  On the XML files load the call back is called and the object does the appropriate processing.  Once this does its thing we now can use it to parse our XML. 

On the onload event for the page in my little test I make two calls to different methods.  The same methods are supported on this class as the XML mini me but additional ones are included like 'SelectNodesAttributes'.  Also I noticed in firefox by 'onload event gets called twice so I put a flag on it so it only fires once.  So in this sample I call the two methods that return arrays but you can have direct access to the DOM and use xPath etc using NewDOM.XmlDocument.