.I am using IIS server...
No, you are not.
This has NOTHING WHATSOEVER to do with IIS.
Unless you mean that EVERY PERSON USING THIS will be running IIS on HIS/HERE PERSONAL MACHINE, then IIS has nothing to do with this.
One more time: WHEN YOU USE SCRIPT IN THE BROWSER, this has *NOTHING* to do with IIS.
One more important question: *HOW* will you know *WHERE* to save the data on the user's machine???
Presumably, every user has DIFFERENT FILES and DIFFERENT DIRECTORIES on his/her machine. If you try to save this into a particular directory (example: C:\SavedFormData
) what happens if the directory does NOT EXIST on some user's machine?