Using Javascript to save an xml file

Question

Hi all,
I want to save an xml file using javascript. and also is it possible to access the local file sytem using javascript.
Here I am just trying to delete a node from xml file and save the xml file.
function deleteNode() {
    var xmlDoc;
    var txt;
    var nodes;
    var c;
    var parents;
   xmlDoc = new ActiveXObject('Microsoft.XMLDOM');
    xmlDoc.load("wkflow.xml")
    nodes = xmlDoc.getElementsByTagName("Activity");
    for (i = 0; i < nodes.length; i++)
    {
        txt = xmlDoc.getElementsByTagName("Activity")[i].getAttribute("ID");
        c =xmlDoc.getElementsByTagName("Activity")[i];
        if (txt == outsideFunction.pid) {
        c.parentNode.removeChlid(c);
        xmlDoc.save("C:\\Temp\\wkflow.xml"); ---here was the problem

or
      xmlDoc.save("wkflow.xml");--- here was the problem
                                
                        
     }
Xml- sample
<act>
<Activity id=10>x</Activity>
<Activity id=10>x</Activity>
</act>