JavaScript & XML : Can't save files

I am trying to manipulate an XML document from within a page. I change the
XML object succesfully, but I cant save the changes to the actual text
file. If anyone has any experience with something similar, I would
appreciate any input.
I have tried these, and neither of them seem to work:

JavaScript: FSO
var fso = new ActiveXObject("Scripting.FileSystemObject");
var File = fso.CreateTextFile("E:\somePath\UrlData.xml" , true);
File.write(XmlUrlData.xml);

/***********XMLDOM*****************/

objXMLdoc.loadXML(XmlUrlData.xml);//already created this object
objXMLdoc.save("UrlData.xml");
 //or
XmlUrlData.save(XmlUrlData.XMLDocument);//object does exist
 //or 
XmlUrlData.save(objXMLdoc.XMLDocument);
//or
XmlUrlData.save("e:\inetpub\wwwroot\Test\Urls\UrlData.xml");

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