document.getElementById("oframe").Save("c:/temp/myfile.doc");

document.getElementById("oframe").HttpInit();
document.getElementById("oframe").HttpAddPostCurrFile("FileData", "myfile.doc");
document.getElementById("oframe").HttpPost("http://mytest/upload.aspx");

for (int i = 0; i < Request.Files.Count; i++)
                        {
                            if ((Request.Files[i].FileName == "" && Request.Files[i].FileName != null))
                                continue;
                            if (Request.Files[i].ContentLength > 0)
                            {
                                string filename = System.IO.Path.GetFileName(Request.Files[i].FileName);
                               
                                HttpPostedFile file = Request.Files[i];
                                byte[] fileContents = new byte[file.ContentLength];
                                file.InputStream.Read(fileContents, 0, file.ContentLength);

                                SPFile spFile = folder.Files.Add(filename, fileContents, true);

                                spFile.Item.SystemUpdate();

                                file.InputStream.Close();
                                file.InputStream.Flush();
                            }
                        }