for starters, it helps to make sure your pages validate:
rummaging through a site that isnt valid is a pita for ppl that arent as "intimate" with how you have things set up.
Additionally, it would be helpful if you described exactly what you mean by "pops out". Ive looked at that link in ff and ie, and while I see where an image is extending past what looks like
<div, it doesnt fit my definition of that phrase.
As all the images are the same size, they look to be aligned in within the same vertical plane. I would reccommend decreasing all of their sizes (specifically the widths), that might fix whatever problem you appear to be seeing.
You need to remember that you are using a fixed width theme -- tack on some padding and margins, and your left with even less room. That inner div is 487 px wide, your images are 470px wide.