Aligning images

I’m trying to align images within the header of my page. I’ve got my main image set with this image…

position: relative; top: 0px; left: 15px;

…which aligns it in the far left corner, which I want.

I’m wanting to align another image on the other side of the page on the same line. I’ve tried everything to get it on the same line, but when I do…

position: relative; top: 0px; right: 25px;

It just sets the image under it.

Any help would be appreciated.