/* fully-qualified URLs, both quoted and non-quoted */
body
{
  background: url("http://www.msn.com/foo.gif");
}
div
{
  background: url(http://www.msn.com/foo.gif);
}

/* simple file name, both quoted and non-quoted */
span b 
{
  background: url(yellow.gif);
}
span em 
{
  background: url("yellow.gif");
}

/* relative rooted paths, both quoted and non-quoted */
ul
{
  background: url("/foo/bar/ack.gif");
}
ul li
{
  background: url(/foo/bar/gag.gif);
}

/* reltive paths, both quoted and non-quoted */
ol
{
  background: url("foo/bar/ack.gif");
}
ol li
{
  background: url(foo/bar/gag.gif);
}