can someone do a fast photoshop two tone for me?

 hey guys/gals i am the first to say im computer slow, having said that i need some help with a photoshop.  i own mason rushs old expo and im throwing around the idea of two toning it the color it is now on the top and a cream white on the bottom.  if anyone can help me out with that it would be so awesome cause i would love to see what it would look like before i spend the time/money to paint it and not like it. thanks ahead of time, here is a pic, i hope i can get it to work

Here is a quicky for ya... I've loved that truck for a long time myself, good choice man  

thanks a ton for that man, and the kind words about the truck, its always been my fav so when i got a chance to own it i jumped on it.