Create A Yellowing Picture Photoshop Tut

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Hi recently I began my Photoshop self-study and really enjoyed making some simple video tutorial (Mmm.. temporarily call it "tutorial"). I devided to make it a series so when I learn with success these videos can be the milestone of my self-study. Well, here it comes. How to create a yellowing picture in Photoshop CS4.

 

What it looks like

 

And how

http://forums.xisto.com/no_longer_exists/

 

I know there're innumerable Photoshop masters in Xisto(now Xisto), so any suggestion is welcome.

 

Cheers