function addDownload(from, to, title)
{
   var dm    = Components.classes["@mozilla.org/download-manager;1"].getService(Components.interfaces.nsIDownloadManager);

   var ioService  = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
   var uri = ioService.newURI(from, null , null);
   var url = uri.QueryInterface(Components.interfaces.nsIURL);

   var file = Components.classes['@mozilla.org/file/local;1'].createInstance(Components.interfaces.nsILocalFile);
   file.initWithPath(to);
   var fileURI = ioService.newFileURI(file);

   var nsIWBP = Components.interfaces.nsIWebBrowserPersist;
   var persist = Components.classes['@mozilla.org/embedding/browser/nsWebBrowserPersist;1'].createInstance(Components.interfaces.nsIWebBrowserPersist);
   var flags = nsIWBP.PERSIST_FLAGS_NO_CONVERSION |
           nsIWBP.PERSIST_FLAGS_REPLACE_EXISTING_FILES |
           nsIWBP.PERSIST_FLAGS_BYPASS_CACHE;

   persist.persistFlags = flags;


   var download = dm.addDownload ( 0 , uri , fileURI , title || from, null , null , null , null, persist );
   persist.progressListener = download;
   persist.saveURI(uri, null, null, null, "", fileURI);
}

function addDownload(from, to, title)
{
   var tr = Components.classes["@mozilla.org/transfer;1"].createInstance(Components.interfaces.nsITransfer);

   var ioService  = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
   var uri = ioService.newURI(from, null , null);
   var url = uri.QueryInterface(Components.interfaces.nsIURL);

   var file = Components.classes['@mozilla.org/file/local;1'].createInstance(Components.interfaces.nsILocalFile);
   file.initWithPath(to);
   var fileURI = ioService.newFileURI(file);

   var nsIWBP = Components.interfaces.nsIWebBrowserPersist;
   var persist = Components.classes['@mozilla.org/embedding/browser/nsWebBrowserPersist;1'].createInstance(Components.interfaces.nsIWebBrowserPersist);
   var flags = nsIWBP.PERSIST_FLAGS_NO_CONVERSION |
        nsIWBP.PERSIST_FLAGS_REPLACE_EXISTING_FILES |
        nsIWBP.PERSIST_FLAGS_BYPASS_CACHE;

   persist.persistFlags = flags;

   tr.init(uri , fileURI , title || from, null , null , null , null )
   persist.progressListener = tr;
   persist.saveURI(uri, null, null, null, "", fileURI);

}