CSS question here?

[Wyngs]

Here's a paraphrase from a line in the CSS for my site. My problem is my
webcam software does not upload a large enough image to work as the
background to the page. Is there any way to modify the statement below
to enlarge the displayed ispy.jpg on the background?

Thanks in advance.

BODY { font-family : Tahoma ; background-image :
url(http://blahblah/blah/ispy.jpg) ;