HTML image bottom alignment inside DIV container

Set the parent div as position:relative and the inner element to position:absolute; bottom:0

This is your code: http://jsfiddle.net/WSFnX/

Using display: table-cell is fine, provided that you're aware that it won't work in IE6/7. Other than that, it's safe: Is there a disadvantage of using `display:table-cell`on divs?

To fix the space at the bottom, add vertical-align: bottom to the actual imgs:

http://jsfiddle.net/WSFnX/1/

Removing the space between the images boils down to this: bikeshedding CSS3 property alternative?

So, here's a demo with the whitespace removed in your HTML: http://jsfiddle.net/WSFnX/4/