Editing a XML file using a form

I am not very literate it with coding, let alone describing this stuff. If you don’t get it, visit http://theappshare.com and you will see what I am describing.

This is what I want to do. I need the help of you guys to get it done.

I currently have a full flash site reading information from XML files. What I want to do is create a form, specifically a form for users to fill out so it could include the following:

Title / <title>: Application (I don’t want users to be able to change this)

URL / Download Link / <url> : Link to download

App Icon / <tmb>: Link to image

Screenshots / <img>: Screenshots of App

Category & Version / <topic>: App category and version

App Info & Description / <description>: App information and description

There is variable <img> which shows the larger image after user clicks on content area. I want to know if I can somehow change this area so I can add more pictures, rather than 1 large one. I know this will require some FLASH editing, but I want to know if it is possible, and if so, how?

The data format in the XML is in the code below. That is how the information is submitted. I want to know how I can make a form, whether PHP, ASP, whatever, to where the bold text above is on the form (what the user sees), and when submitted, it adds all the information to the end of a designated XML file in the format below.



    <image>
        <title>Application</title>
        <url>www.TheAppShare.com</url>
        <img>elite_powerful_dynamic_xml_gallery_galleries/category1/img1.jpg</img>
        <tmb>elite_powerful_dynamic_xml_gallery_galleries/category1/tmb1.jpg</tmb>
        <topic><![CDATA[App Summary will be Here.]]></topic>
        <desc><![CDATA[MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO MoRE INFO ]]></desc>
    </image>