CSS: Position navigation in same place on every post

Hi.

The navigation on my site slides down a bit when there’s a line of type beneath the image in the post, as shown here:

http://queenluna.com/1-i-am-queen-luna/

I’d like the navigation on that page to be aligned with the navigation on this page:

http://queenluna.com/2-planet-myne/

Or to adjust to a happy medium between each. I got it to work in Firefox, Safari and Opera. On Chrome the nav comes too high. Here’s what worked in the other three:

.navigation {
position: absolute;
top: 610px;
margin: auto;
left: 0;
right: 0;
}

It would also be nice in the footer/copyright line stayed in the same place whether there was text under the image or not.

If you have some ideas on how to do this, please let me know. Thanks for taking the time.

Brian