javascript and xml to save data on local machine

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XML

JScript.NET

HTML5

Hi,

I have a simple html form that accepts user input data like name,dob and phno etc. I need to store this on my local machine(Strictly XML). I need to create a xml file on my local machine and store all the data from the form. I further need to use XMLROWSTRING to query back the results from the stored data. Any ideas as to how I can create a xml doc, If i can get the data saved on my local machine[Stuck right here], I will then use HTML5 Localstorage to query the results from it.
cheers
Thanks in advance!!!

Regards,
ghr