rotate.php in header not showing, nor any graphic

I have modified the #header in either/both of the css files style.css and blue.css with the following code and the graphic isn't showing. (yes I flushed cache and verified that if I type in the rotate.php url directly in the browser it works fine).

#header {
  background: maroon url('../images/header/rotate.php') center top no-repeat;
}

Of course in the blue.css it has the ../ and in style.css it does not. Of course I've tried simple graphic links, and tried placing graphics in the same folder as the css and I've read everything I can find that has a reference to the header, but I'm just not seeing why this isn't working.

So, my question is probably just one of my missing something obvious, but... Why isn't this working and what can I do to fix it? I know this rotate.php works in other themes (like marinelli) so why not here? What is it that is making this theme not accept it?

Please help! Thanks in advance...