Possible Duplicate:
Css z-index problem
I have an issue where one image is infront of another and z-index doe
z-index:0;
isn't a good value to use. You should use 1 as a minimum. 1 is the window base. 0 is technically below the window.
You simply need to call the right element (the anchor not the image within it) since the anchor is the container. Then it's a matter of margins and position for placement.
jsFiddle Here