HTML FTP Transfer made simple

I need to create a very simple way for my clients to move audio from their computer to a folder on my web site. I invision a split screen, the left side, they can see folders on ther computer and the right side they can see folders on one folder only that I assign them on my web site. Just like a FTP program, they can click "Send A File" from their computer to their folder on my web site. They can also DELETE FILES within that folder on my web site. So the idea is that they can go on their BROWSER and type in an address to a specific folder. When the page showing that folder comes up on their browser, they are able to transfer files from their computer to that folder and/or delete files as well. How simple can this be done without getting into using a regular FTP program? Can what I am describing be done? If so, please submit your plan and price quote.