How to center an image horizontally and align it to the bottom of the container?

Question

How can I center an image horizontally and aligned to the bottom of the container at the same time?

I have been able to center the image horizontally by its self. I hav

Answer 1

wouldn't

margin-left:auto;
margin-right:auto;

added to the .image_block a img do the trick?
Note that that won't work in IE6 (maybe 7 not sure)
there you will have to do on .image_block the container Div

text-align:center;

position:relative; could be a problem too.