How to make background image to repeat itself

I want to make background image repeat itself while visitor is scrolling down. Theme is GameZone.

I don't know css, but I am a quick learner.
I wolud really appreciate at least some hint/tip how to do it?

style.css

body {	
	color:#252525;
	position:relative;
	background:url(images/body.jpg) no-repeat top center;
}

background:url(images/body.jpg);

no-repeat - del.
top center - position of bg

Thanks, I will try it.