How do I download a file using phonegap 1.5 (Cordova) for BlackBerry and mango windows?

I am writing a phonegap application that needs to download a file (pdf, doc, txt).
I am using phonegap 1.5.0 i.e. Cordova 1.5.0.js.

I looked into the handset api at
http://docs.phonegap.com/en/1.5.0/phonegap_file_file.md.html#FileTransfer
and is trying to use the FileTransfer upload method. the following code i am using:

save: function (fileName, fileType, url) {
    documentsaver.fileName = fileName;
    documentsaver.fileType = fileType;
    documentsaver.url = url;
    window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, fsSuccess, fail);

    function fail(event) {
        jqmSimpleMessage('Error Code ' + event.target.error.code);
    }

    function fsSuccess(fileSystem) {
        documentsaver.directoryEntry = fileSystem.root;

        //Creating directory in which document should be saved if it does not exist
        documentsaver.directoryEntry.getDirectory(documentsaver.directoryName, { create: true, exclusive: false }, dirSuccess, fail);

        function dirSuccess(parent) {
            console.log('Directory Created at '+parent.fullPath+' with name '+parent.name);
            //Moving directoryEntry reference to newly created directory
            documentsaver.directoryEntry = parent;

            //Creating file which will be written
            var completeFileName = documentsaver.fileName + '.' + documentsaver.fileType;
            console.log('completeFileName === >' + completeFileName );
            var filePath = documentsaver.directoryEntry.fullPath + '/' + completeFileName;
            console.log('filePath === >' + filePath );

            var fileTransfer = new FileTransfer();
            fileTransfer.download(
                    url,
                    filePath,
                    function(entry) {
                        console.log("download complete: " + entry.fullPath);
                    },
                    function(error) {
                        console.log("download error source " + error.source);
                        console.log("download error target " + error.target);
                        console.log("upload error code" + error.code);
                    }
                );
        }

      

        
        
        
      

    

filename: the name of the file I am saving.
fileType: fileType, that is, pdf or doc or png.
url: link to a real resource.

Below is the console log when I run it on a Windows emulator:

Log: "This is the
Stream directory (0xf0a01c6) exited with code 0 (0x0).
Log: "filePath ===> / JarusDocuments / Personal Auto Application.pdf"
Stream '' (0xff001f6) exited with code 0 (0x0).
Log: "Directory created in / JarusDocuments named JarusDocuments"
Log: "Error in success callback: File11 = Object does not support property or method" load "

Stream" (0xe3201b6) exited with code 0 (0x0).
Stream "(0xf18014e) exited with code 0 (0x0).
Log: "completeFileName ===> Personal Auto Application.pdf"
Stream '' (0xf1c01de) exited with code 0 (0x0).

FileTransfer is said to not support upload method. Although the magazine already says that it can create all the directories I want.