I made a tutorial covering this, you can find it: Here
I hope this was able to help you, if you have any other questions, just feel free to ask.
edit: Errr...I realized the tutorial I made was similar but not exactly what you are looking for, I will make another one for you with the changes needed and post it here. It's still just as easy, just requires a few minor tweaks.
edit 2: Here is the link to the correct tutorial: Here
Sorry about that, I hope this will really help you!