I am a new themer and i have been working on a really cool theme now for a while, and i am kinda new so i was wondering if anyone could help me out..

Basically i want to know how to edit two things on the iphone lockscreen. 1. the lockscreen clock background image, and 2. the slider background image.

I know how to change the slider with bottombarknobgrey.png and all that but ive looked around and cant really find much on the other two images that im looking for so if anyone could help me that would be amazing... thanks!