Ah.  Multiple background images.
given the following statement
body {background: url(foo) url(bar);}
it seems to make sense to me that it would follow the rather common x-y sequence.  so that the most commonly stated order of each axis would be repeated in this case.
Also, though initially it seems to make sense to me that some sort of punctuation would delineate the x vs y bg images, especially when you start to add in additional parameters like
body {background: #fff url(foo) repeat-x 3em 50px url(bar) repeat-y 0 50px}
that's an unfamiliar CSS convention.  Precedent would seem to indicate that punctuation for multiple properties should not be separated by spaces.
Thanks for the work.
Paul Bellows :: Yellow Pencil
#230, 10113 104 Street, Edmonton, AB T5J 1A1