Modifying a google map query string

[eluser]brian88[/eluser]
When a user submits this form, I want to take "Orlando,+fl" in the query string and replace it with their city and state fields

So it would be...
maps.google.com/maps?hl=en&q=from:+city,+state+to:+Celina,+OH+45822&ie=UTF-8

Code:

<form action='https://maps.google.com/maps?hl=en&q=from:+Orlando,+fl+to:+Celina,+OH+45822&ie=UTF-8' method='get' accept-charset='utf-8'>
      <input type='text' name='city' value='City' />
      <input type='text' name='state' value='State' />
      <input type='submit' value='Get Directions'>
</form>

How can I go about doing this in code igniter? Or is it easier in jQuery?