Fixed Background Image

[Løque]

Hello to all!
How can i fixed the background image?

The ID 'body' now:

body {
	background: #000000 url(../css/sfondo.gif);
	color: #000;
	font-family: Verdana;
	font-size: 13px;
	text-align: center; /* IE 5 fix */ 	line-height: 1.4
}