Quick help on easy question - positioning item onon bottom of screen

I need to fix an swf. and image files to be a certain height from the bottom of the browser, not the top. whats the easiest way to do this? I tried creating a bottom colunm of a fixed height but the image and flash file don't align with the bottom of the top column, and creating a top column didn't fix it because it can't be set to auto for some reason

so I eaither need to fix the column a certain width from the bottom with the images centered or find some way to align the iamges with the bottom of the column right?