iPhone API for updating website listings?

[eluser]Zeeshan Rasool[/eluser]
Dear friends,
I have to do a task which i have not done before. My client need an application for iphone thru which he can update his listing records on website
Just i need a CMS type module for his iphone, But i have no idea about this.
I need some help about this that what i need for implementing this?
Any one please who know about this that how can i do this for my codeigniter website.

Very thanks to all

Cheers

[eluser]pistolPete[/eluser]
What do you need exactly?

Can't you just use a web application which the user accesses using Safari on his iphone?