ASP form writes XML file

Need an ASP Form to create a XML file. I have 80% of it done. The ASP script first checks to see if the XML file exists. If not, the script creates the XML file and adds the information. If the file already exist, the script will add the new information to the existing information. The problem is getting ASP to format the XML file correctly. ([login to view URL] file is in the correct XML format, that I wish to see as the end result)