I also had a situation once where I had a client that did not want to use JScript and wanted everything to be written in VBScript. I had a heck of a time trying to get an existing form to do that. I read the following link -
http://www.kbalertz.com/kb_828853.aspx - and it did the trick. Following these steps will purge your manifest of the script.js file. That should hopefully get you over your problem.
Also, did you try deleting the JScript code from the script.js file?
Hope you have everything backed before you do anything.
Good luck...