Help with background alignment

Help with background alignment?

here is my code:
<style type="text/css">body {
background-image: url("http://i15.tinypic.com/4po7674.jpg"...
background-align: bottom left;
background-repeat: no-repeat;
background-color:99fe40;
background-attachment: fixed;
}</style>
but everytime i do it.
the background doesn't stay on the bottom left!
it just stays at the top left.
how do you fix this?