Returns a reference to a newly created virtual W3C DOM Document (not the document node of an HTML document) object. Netscape 6 extends this Document object with a load( ) method that permits the loading of XML documents into the browser, although they are invisible to the user. Scripts may then access the document tree of the XML document as a data source for rendering information in the HTML document. If you are loading an external XML document, you can create the Document object with blank values for the three parameters:

var myXDoc = document.implementation.createDocument("", "", null);