how do I get it to center? it seems that it aligns to the left then becomes a second backround going to the right. =/

body{background:url(http://www.yoururlhere.com/picture.ext)
background-repeat:norepeat;
background-position:center;}

Put that in your style sheet and it should stop your background from repeating, and it will center the image.

A few errors in your code there..

body{background:url(http://www.yoururlhere.com/picture.ext);
background-repeat:no-repeat;
background-position:center;}

Oops, haha. I knew something didn't look right when I got done with it, but couldn't figure out what it was. Thanks, kittycat. :D