Dear, I need your help for the next:

I want keep my website middle of the screen with equal space left and right

The width of the site is 860px (container) and the height is up to the content

The container has 5 DIVs as follow:

container: width:860px; heigth auto
header: width:860px; heigth 150px
left:width:140px; heigth auto
middle:width:560px; heigth auto
right:width:140px; heigth auto
footer:width:860px; heigth 20px;

How can do this with css ?

Thanks in advance,