Changing the application folder

[eluser]sirfak[/eluser]
Hi
My production file structure is as follows
/public_html>>Planyourweekends>>System>>application
>>index.php

I want to move my application folder at the same level as System folder so that my folder structure will look like

/public_html>>Planyourweekends>>System
>>application
>>index.php


Now I have following questions:

What changes do I need to do in any file(say index or config)
Thanks
sirfak