A Way to View and Edit and Save a XML File in a Web Browser

I have a program I have written that displays the contents of a xml file in a browser. I am trying to make it more user friendly for people to change the xml files without opening them in notepad or a canned xml editor. What I would like to do is be able to pull the information from the xml file into a webpage and allow the users to make changes and save it back to the xml file. I've done google searches for about a week and can't come up with a good way to do it. Any suggestions would be much appreciated.