Change image to display

[kurie]

Hi All
Intranet- I would like to change the default image, say for Documents. Under Documents i have diferent groups, like CEO's Desk, IT Corner etc, what i would like to do is assign an image for each and every sub-document group. eg CEO's Desk grouping must have its own image, IT group must have its own image.
Does annyone know how to change this.

Thanks u