is there anyway i can size this image to take up the entire background space?

right now, i'm doing this:
<style type="text/css">
<!--
body {
background-image:url(blogbeachrory.jpg);
background-repeat:no-repeat;
background-position: 0% 0%;
}
-->
</style>

but my picture isn't big enough and i want it to be this single huge background. is there a program where i type in the top left hand corner number and the bottom right hand corner image so it can resize to the right background or anything?
thanks

You can't changed the size of the background image... you could open the image up in a graphics problem and resize it that way, but there's no code in which you could do that.