How to make Wavy gradients as in sample (attached)

[lok]

Hi,

Though I have been using PS for a while now, however I consider myself a newbie. I am attaching a banner here. I would like to know how to make those wavy gradient background as shown in the image. I have tried it but does not exactly get it right. Pls guide.

thanks,
lok.

 

[AbdulW87]

http://psd.tutsplus.com/tutorials/tutorials-effects/create-a-wavy-blackberry-style-wallpaper-design/

check this out havent read the full tut but its pretty much what you want