Quick html question on backgrounds?

[Steven]

Hi,

I'm trying to set up a background for me tumblr blog and the image I is tiled. How do I make it so that there is just one big image in the back?

Here's the code I have so far:

body {
background-image: url(http://27.media.tumblr.com/preview.j86QxxptgXYhiOt8_500.jpg);
background-repeat: repeat;
background-attachment:fixed;
overflow:scroll;
color: #FFF;
font-family: Georgia, "Times New Roman", Times, serif;
text-decoration: none;
background-attachment: fixed;
}