how I can define div that doesnt have image...

HI

I define Div in my page and I define background image for my page's Body

body 
{
    background:url(../image/BGheader21.png) ;
      text-align:center;
}

now I want the Div that I define, doesn't have any background and it show Body's Background Image

in below image imagin that flower is body's background image and  div with red border  is div that I define I want some thing like below image

How I can do it?

Best Regards

Neda