body {
    background-image:url('apple.gif');
}

body {
     background-image:url('backgroundpic.jpg');
}

body
{
     background-image:url('whateverimage.png');
     background-repeat:repeat-x;
}

body
{
     background-image:url('apple.png');
     background-repeat:no-repeat;
     background-position:right top;
}

Shorthand version of the above

body {
     background:#ffffff url('img_tree.png') no-repeat right top;
}