Removing album art from pictures displayed on 360

hey all,

sorry about the confusing subject line.

basically, i’ve started using windows media centre on my xbox 360 (streaming from vista laptop). when i view a slideshow of the pictures folder, it includes all the album covers stored in the music folder on my pc as well. this is because mc only asks which folders you would like to share (not the type of content you want displayed).

is there anyway to remove the sharing of pictures from the music folder. have i missed anything obvious? thanks