I\'ve a code of some what like this:
I don't know why everyone is so fixed on the #foo div. You can target the img tag and not even worry about the div tag. These attribute selectors select by the "begins with".
img[src^=bar] { css }
img[src^=cat] { css }
These select by "contains".
img[src*="bar"] { css }
img[src*="cat"] { css }
Or you can select by the exact src.
img[src="bar.png"] { css }
img[src="cat.png"] { css }
If you want to target them both, then you could use the div id.
#foo img { css }
For just one of the images, there is no need to worry about the #foo div at all.