文件下载/通过浏览器上传到特定的目标文件夹

I'm working on a web application which needs to download/upload a file from/to the server. The user base for this application, however, is not tech savvy so we we want them to click a button that indicates "Download file" (for this record) or "Upload file" (for this record) without having to rely on the user to "Save As" or indicate the destination folder. In a previous version we've used Software Artisan's SAXFile (an ActiveX control) however we're trying to avoid ActiveX this time around. We're hoping to make the application browser agnostic.I'm working on a web application which needs to