Agree with Twister although we can not all be cured with a change of running technique as some of the others have indicated.
Have a look at this http://www.youtube.com/watch?v=7jrnj-7YKZE then see if you still think you need orthotics or a change in running style.
For the record I tried orthotics running and they caused me more problems. A change in style has helped more than anything else.