protected void btnUpload_Click(object sender, EventArgs e)
        {
            // If no file has been selected, leave the function
            if (uploader.FileBytes.Length == 0 || string.IsNullOrEmpty(uploader.FileName))

            return;


            // Granting privileges
            SPSecurity.RunWithElevatedPrivileges(delegate
            {
                Guid guid = Guid.NewGuid();

                // Picture Library
                SPPictureLibrary list;

                try
                {
                    // Retrieve a reference to the picture library
                    list = (SPPictureLibrary)Site.RootWeb.Lists["Image Picker Picture List"];
                }
                catch
                {
                    // If the library "Image Picker Picture Library" doesn't exists, create the list
                    Guid listGuid = Site.RootWeb.Lists.Add("Image Picker Picture List", SPUtility.GetLocalizedString("$Resources:ListDescription", "ImagePicker", SPContext.Current.Web.Language), SPListTemplateType.PictureLibrary);

                    list = (SPPictureLibrary)Site.RootWeb.Lists[listGuid];
                    list.OnQuickLaunch = false;
                    list.Update();
                }

                // Add the picture in the library
                SPFile it = list.RootFolder.Files.Add(guid + uploader.FileName.Substring(uploader.FileName.LastIndexOf('.')), uploader.FileBytes, true);
                // Update the item
                it.Update();

                // Create the Bitmap from the uploaded picture
                Bitmap image = new Bitmap(uploader.FileContent);

                // Get the dimension of the miniature
                Dimension dimensions = Resizer.GetMiniature(image.Width, image.Height);

                // Changing the picture of the parent page
                Page.Response.Write(@"<script language='javascript'>
                                        opener.document.getElementById('" + Page.Request.QueryString["GUID"] + @"').src = '" + list.ParentWeb.Site.Url + "/" + it.Url + @"';
                                        opener.document.getElementById('" + Page.Request.QueryString["GUID"] + @"').style.visibility = 'visible';
                                        opener.document.getElementById('" + Page.Request.QueryString["GUID"] + @"').style.width = '" + dimensions.Width + @"px';
                                        opener.document.getElementById('" + Page.Request.QueryString["GUID"] + @"').style.height = '" + dimensions.Height + @"px';
                                        opener.document.getElementById('" + Page.Request.QueryString["path"] + "').value = '" + list.ParentWeb.Site.Url + "/" + it.Url + @"'
                                        window.close();
                                      </script>");
            });
        }