Document Upload, PREVIEW and download

Need script to upload, preview, and download documents; Word, Excel, PDF for PHP / Javascript / AJAX with MySQL backend website. It's the preview part we're having difficulty and could use the assistance. Ideally, it would preview documents much like you'd see on gmail, allowing the user to view the document before downloading. The documents will be uploaded to our server, and can not be made public on something like Google Docs, so that cuts down some options. Add a field for user input to name the document or if blank, the documents current name should be displayed for preview or download. A single document can be uploaded at a time. But multiple documents can be uploaded. So, a name input field and a browse/upload button to select the file from the computer directory. Below by row will be listed in order of most recently uploaded, each document uploaded with download and preview button/mouseover/click action to view without downloading. For bids, I want to see a working version. You'll provide a link. Hopefully someone has already done this work and it's simply a chance for them to be paid a second time for the same work. I'm open to paid 3rd party solutions, but would prefer open source. The winner will provide all script for the working solution and just a short description of what was implemented. We'll do the implementing on our side.