Actually I have a URL like this

abc.com?country=india&state=haryana&city=karnal

I have a select option in my code like this

<select onchange="location=this.value;">
   <option value="">karnal</option>
   <option value="">panipat</option>
   <option value="">ambala</option>
   <option value="">kurukshetra</option>
</select>

Now I want to change state city parameter in URL? How can I do that?